php关于ob_gzhandler和gzencode（）
前一段时间要搞一个gzip压缩输出，想着在文件里用ob_start('gz_handler');结果客户端始终打不开。
改成gzencode($data, 5); 之后能正常打开。
ob_gzhandler — 在ob_start中使用的用来压缩输出缓冲区中内容的回调函数。
gzencode — 创建gzip压缩字符串
gzencode ( string $data [, int $level = -1 [, int $encoding_mode = FORCE_GZIP ]] )
This function returns a compressed version of the input data compatible with the output of the gzip program.
标签: php压缩输出
composer 报错：Installation failed, reverting ./composer.json to its original content.
tp5使用composer安装Image类的时候报错，
composer require topthink/think-image
错误提示：Installation failed, reverting ./composer.json to its original content.
修改方法：
1、在composer.json文件里"require"下添加代码：
"topthink/think-image" : "^1.0",然后执行
composer update
标签: failed composer Installation
php 获取毫秒
<?php
//获取毫秒
function msectime() {
list($msec, $sec) = explode(' ', microtime());
$msectime = (float)sprintf('%.0f', (floatval($msec) + floatval($sec)) * 1000);
return $msectime;
}
$start_time = msectime();
$end_time = msectime();
echo '执行时间：'. $end_time - $start_time;
php 计算阴历、阳历、属性、星座方法
<?php
// 公历，农历转换，属相，星座的计算
/**
* 1912年到2135年的数据
*
***************************************************************************
* 前二数字 = 闰月月份, 如果为 13 则没有闰月 *
* 第叁至第六数字 = 12 个月之大小月之2进位码->10进位 *
* 例如: *
* 101010101010 = 2730 *
* 1 : 代表大月(30天) 0 : 代表小月(29天) ==> 1月大2月小3月大.. *
* 第七位数字为闰月天数 *
* 0 : 没有闰月之天数 *
* 1 : 闰月为小月(29天) *
* 2 : 闰月为大月(30天) *
* 最後2位数字代表阳历之1月1日与阴历之1月1日相差天数 *
***************************************************************************
*/
class Lunar {
var $LMDay = array();
var $InterMonth = 0;
var $InterMonthDays = 0;
var $SLRangeDay = 0;
var $SMDay = array(1 => 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
var $LongLife = array( 1 =>
'021327123', '131175041', '091614130', '133402048', '133749037', '06938227',
'131389044', '13694034', '032142224', '132350043', '113223131', '132709050',
'133402039', '083498128', '132901046', '131387035', '04730126', '132653044',
'132349033', '023371122', '132709041', '092893130', '131706047', '132773037',
'061397127', '131210045', '132651034', '031111224', '131323042', '112708232',
'133733049', '131706038', '082778128', '132485047', '131206035', '042734125',
'132639044', '131318033', '023366221', '133413040', '101449230', '131386048',
'132413037', '061181227', '131182045', '132637035', '043405123', '133365042',
'113411131', '132900050', '132906038', '082394228', '132395047', '131179036',
'042711125', '132635044', '132725033', '013749122', '131748039', '112779129',
'13694048', '132359038', '061199127', '131175045', '131611034', '031866124',
'133493041', '111717130', '131389049', '13686039', '072366128', '132350047',
'133222036', '053349225', '133402043', '133493032', '01853222', '131386040',
'102670129', '132653048', '132349038', '062731127', '132709045', '132890034',
'042986123', '132773042', '131370030', '022234220', '132651039', '071335129',
'131323046', '131683035', '051813225', '131706043', '132773032', '031461122',
'131206040', '082654130', '132638048', '133366037', '063750126', '133410045',
'133498033', '041642223', '131389041', '131198031', '032717120', '132637039',
'073371128', '132853047', '133410035', '053412224', '132906043', '131373032',
'031371122', '131179040', '072647130', '132635049', '132725038', '062917127',
'131746045', '132778035', '041462124', '132359043', '131175032', '031687122',
'131611039', '071706129', '133493047', '131450036', '052796125', '132734044',
'132350034', '033374123', '133222041', '083397230', '133402049', '133413038',
'061429227', '131386045', '132670035', '041373125', '131325042', '132709032',
'033221221', '132890040', '072890228', '132773047', '131370036', '052618226',
'132651044', '131323033', '042583223', '131683041', '091707130', '131706048',
'132741038', '061269128', '131206045', '132647035', '041326125', '133350043',
'133731031', '031874121', '133498039', '071450229', '131389046', '131198036',
'052589226', '132605045', '133349033', '043493122', '132898041', '093434130',
'132778048', '131373037', '06667228', '131115046', '132603035', '052859124',
'132709043', '132898032', '022738220', '132774039', '071366229', '132359048',
'131111036', '051623126', '131323044', '131685033', '031941122', '131450040',
'102742130', '132669049', '131198037', '062670127', '132646046', '133402035',
'053754123', '133413042', '131450031', '032922121', '132669039', '071213129',
'131195047', '132701037', '053413125', '132858044', '132901033', '041493123',
'131242040', '132397030', '021367120', '131179038', '062711127', '131611045',
'131705034', '042986124', '131717042', '13698032', '022742122', '132359041',
'061326130', '133350048', '133659037', '051746127', '133497044', '131461033',
'03877124', '13686042', '132606031', '023629120', '133221039', '063413128',
'132898046', '132921035', '041498125', '131373043', '13605032', '032651122',
'131579040', '072699230', '132709048', '132890037', '052858226', '132773045',
'131371033', '04695124', '13599042', '091327131', '131323049', '131685038',
'061749128', '131450046', '132741035', '041389125', '131198043', '132647033',
'031109222', '133370040', '073722229', '133413048', '131450036', '052778126',
'132397045', '131198034', '042731123', '132637042', '083371131', '132857050',
'132901038', '071397128', '13730046', '132397036', '051239125', '131179043',
'132635033', '032635222', '131705039', '082777129', '131717047', '13694037',
'052358226', '132359045', '131175034', '041686124', '133658041', '103750130',
'133497049', '131453038', '06685228', '13686046', '132350036', '053245125',
'133221043', '133402032', '033402221', '132921040', '071402129', '131371047',
'13605037', '052395127', '132347045', '132709034', '043477123', '132890042',
'132837030', '021749120', '131371038', '06631129', '13599046', '131323035',
'052730125', '133733043', '131706031', '032986121', '132741040', '081213130',
'131198048', '132647038', '051357128', '133366046', '133477034', '041621224',
'131386042', '132477032', '021373121', '131198039',
'132637048', '133365036', '053365225', '132900044', '131386034', '022778122', //6
'132395041', '071175231', '131175050', '132635038', '052891127', '131701046', //12
'131748035', '042741223', '130694043', '132391032', '021327122', '131175040', //18
'061623129', '133402047', '133402036', '051769125', '131453044', '130694034', //24
'032158223', '132350041', '073213230', '133221049', '133402038', '063466226', //30
'132901045', '131130035', '042651224', '130605043', '132349032', '023371121', //36
'132709040', '072901128', '131738047', '132901036', '051333226', '131210044', //42
'132651033', '031111223', '131323042', '082714130', '133733048', '131706038', //48
'062794127', '132741045', '131206035', '042734124', '132647043', '131318032', //54
'033878120', '133477039', '071461129', '131386047', '132413036', '051245126', //60
'131197045', '132637033', '043405122', '133365041', '083413130', '132900048', //66
'132922037', '062394227', '132395046', '131179035', '042711124', '132635043', //72
'102855132', '131701050', '131748039', '062804128', '132742047', '132359036', //78
'051199126', '131175045', '131611034', '031866122', '133749040', '081717130', //84
'131452049', '132742037', '052413127', '132350046', '133222035', '043477123', //90
'133402042', '133493031', '021877121', '131386039', '072747128', '130605048', //96
'132349037', '053243125', '132709044', '132890033',
'042986122', '132773040', '091373130', '131210048', '132651038', '061303227',
'131323045', '132707035', '041941124', '131706041', '132773031', '021461121',
'131206039', '062670128', '132638047', '133366036', '053750125', '133411043',
'131450032', '031898122', '132413041', '111199130', '131197048', '132637038',
'063339227', '133365045', '133410034', '053540123', '132906042', '131389030',
'021371121', '131179039', '072647129', '132635047', '132725036', '052853225',
'131746043', '132778032', '031206222', '132359041', '081183130', '131175048',
'131611037', '061674227', '133749045', '131714033', '042668223', '132734042',
'132350032', '033374120', '133222039', '073413128', '133402047', '133493035',
'051493125', '131386043', '132669033', '041373122', '131325040', '082715130',
'132709049', '132890037', '062922126', '132773045', '131370034', '042746123',
'132651042', '131323031', '032855121', '131683038', '071843128', '131706046',
'132773036', '051205225', '131206043', '132647033', '041358123', '133366040',
'083734129', '133410048', '133498037', '061706226', '131389044', '131198034',
'042717124', '132637042', '133349031', '023877120', '133410039', '073506128',
'132906047', '131373036', '051243127', '131179044', '132635034', '043403123',
'132725042', '092901130', '131746048', '132774038', '061398128', '132359046',
'131175035', '041687125', '131355043', '131701031', '031957121', '131706039',
'072730229', '132733047', '131326036', '053246126', '132710045', '133402033',
'043658222', '133477041', '091453130', '131386048', '132669038', '061309228',
'131325046', '132701035', '053349224', '132858043',
);
function getLar($date, $isLunar = 1){//1为旧历0为新历
list($year, $month, $day) = split("-", $date);
if($isLunar == 1)
return $this->Lunar2Solar($year, $month, $day);
else
return $this->Solar2Lunar($year, $month, $day);
}
function IsLeapYear($AYear){
return ($AYear % 4 == 0) and (($AYear % 100 <> 0) or ($AYear % 400 == 0));
}
function CovertLunarMonth($magicno){
$m = $magicno;
for ($i = 12; $i >= 1; $i--){
$size = $m % 2;
if ($size == 0)
$this->LMDay[$i] = 29;
else
$this->LMDay[$i] = 30;
$m = floor($m / 2);
}
}
function ProcessMagicStr($yy){
$yy = $yy - 1583;
$magicstr = $this->LongLife[$yy];
$this->InterMonth = substr($magicstr, 0, 2);
$LunarMonth = substr($magicstr, 2, 4);
$this->CovertLunarMonth($LunarMonth);
$dsize = substr($magicstr, 6, 1);
switch ($dsize) {
case 0 :
$this->InterMonthDays = 0;
break;
case 1 :
$this->InterMonthDays = 29;
break;
case 2 :
$this->InterMonthDays = 30;
break;
}
$this->SLRangeDay = substr($magicstr, 7, 2);
}
function DaysPerLunarMonth($LYear, $LMonth){
$this->ProcessMagicStr($LYear);
if ($LMonth < 0)
return $this->InterMonthDays;
else
return $this->LMDay[$LMonth];
}
function Solar2Lunar($SYear, $SMonth, $SDay){
if( !(1582 <= $SYear && $SYear <= 2135) ){
return false;
}
$day = 0;
if ($this->isLeapYear($SYear))
$this->SMDay[2] = 29;
$this->ProcessMagicStr($SYear);
if ($SMonth == 1)
$day = $SDay;
else {
for($i = 1; $i <= $SMonth-1; $i++)
$day = $day + $this->SMDay[$i];
$day = $day + $SDay;
}
if ($day <= $this->SLRangeDay) {
$day = $day - $this->SLRangeDay;
$this->processmagicstr($SYear-1);
for ($i = 12; $i >= 1; $i--){
$day = $day + $this->LMDay[$i];
if ($day > 0)
break;
}
$LYear = $SYear - 1;
$LMonth = $i;
$LDay = $day;
} else {
$day = $day - $this->SLRangeDay;
for($i = 1; $i <= $this->InterMonth-1; $i++){
$day = $day - $this->LMDay[$i];
if ($day <= 0)
break;
}
if ($day <= 0) {
$LYear = $SYear;
$LMonth = $i;
$LDay = $day + $this->LMDay[$i];
} else {
$day = $day - $this->LMDay[$this->InterMonth];
if ($day <= 0) {
$LYear = $SYear;
$LMonth = $this->InterMonth;
$LDay = $day + $this->LMDay[$this->InterMonth];
} else {
$this->LMDay[$this->InterMonth] = $this->InterMonthDays;
for ($i = $this->InterMonth; $i <= 12; $i++){
$day = $day - $this->LMDay[$i];
if ($day <= 0)
break;
}
if ($i == $this->InterMonth)
$LMonth = 0 - $this->InterMonth;
else
$LMonth = $i;
$LYear = $SYear;
$LDay = $day + $this->LMDay[$i];
}
}
}
$dated = "$LYear-$LMonth-$LDay 00:00";
return $this->date_to_unixtime($dated);
//return mktime(0, 0, 0, $LMonth, $LDay, $LYear);
}
function Lunar2Solar($LYear, $LMonth, $LDay){
if( !(1582 <= $LYear && $LYear <= 2135) ){
return false;
}
$day = 0;
$SYear = $LYear;
if ($this->isLeapYear($SYear))
$this->SMDay[2] = 29;
$this->processmagicstr($SYear);
if ($LMonth < 0)
$day = $this->LMDay[$this->InterMonth];
if ($LMonth <> 1)
for ($i = 1; $i <= $LMonth-1; $i++)
$day = $day + $this->LMDay[$i];
$day = $day + $LDay + $this->SLRangeDay;
if (($this->InterMonth <> 13) and ($this->InterMonth < $LMonth))
$day = $day + $this->InterMonthDays;
for ($i = 1; $i <= 12; $i++){
$day = $day - $this->SMDay[$i];
if ($day <= 0)
break;
}
if ($day > 0) {
$SYear = $SYear + 1;
if ($this->isLeapYear($SYear))
$this->SMDay[2] = 29;
for ($i = 1; $i <= 12; $i++){
$day = $day - $this->SMDay[$i];
if ($day <= 0)
break;
}
}
$day = $day + $this->SMDay[$i];
$SMonth = $i;
$SDay = $day;
$dated = "$SYear-$SMonth-$SDay 00:00";
return $this->date_to_unixtime($dated);
//return mktime(0, 0, 0, $SMonth, $SDay, $SYear);
}
// 计算生肖
function get_animal($birth_year){
//echo $birth_year;
$animal = array(
'鼠','牛','虎','兔','龙','蛇',
'马','羊','猴','鸡','狗','猪'
);
$my_animal = ($birth_year-1900)%12;
return $animal[$my_animal];
}
// 计算星座
function get_zodiac_sign($month, $day){
// 检查参数有效性
if ($month < 1 || $month > 12 || $day < 1 || $day > 31)
return (false);
// 星座名称以及开始日期
$signs = array(
array( "20" => "水瓶座"),
array( "19" => "双鱼座"),
array( "21" => "白羊座"),
array( "20" => "金牛座"),
array( "21" => "双子座"),
array( "22" => "巨蟹座"),
array( "23" => "狮子座"),
array( "23" => "处女座"),
array( "23" => "天秤座"),
array( "24" => "天蝎座"),
array( "22" => "射手座"),
array( "22" => "摩羯座")
);
list($sign_start, $sign_name) = each($signs[(int)$month-1]);
if ($day < $sign_start)
list($sign_start, $sign_name) = each($signs[($month -2 < 0) ? $month = 11: $month -= 2]);
return $sign_name;
} // end of function
//1970年以前和2038年以后的Unix时间戳转日期 先调用date_to_unixtime()函数
function unixtime_to_date_str($unixtime, $timezone = 'PRC') {
$datetime = new DateTime("@$unixtime"); //DateTime类的bug，加入@可以将Unix时间戳作为参数传入
$datetime->setTimezone(new DateTimeZone($timezone));
return $datetime->format("Y年m月d日H时i分");
}
//1970年以前和2038年以后的Unix时间戳转日期 先调用date_to_unixtime()函数
function unixtime_to_date($unixtime, $timezone = 'PRC') {
$datetime = new DateTime("@$unixtime"); //DateTime类的bug，加入@可以将Unix时间戳作为参数传入
$datetime->setTimezone(new DateTimeZone($timezone));
return $datetime->format("Y-m-d H:i:s");
}
//1970年以前和2038年以后的日期转Unix时间戳
function date_to_unixtime($date, $timezone = 'PRC') {
$datetime= new DateTime($date, new DateTimeZone($timezone));
return $datetime->format('U');
}
}
// 测试
$lunar = new Lunar();
$date = $lunar->getLar('1900-1-7',1); // 计算公历
//echo date('Y-m-d', $date).'<br>';
echo $lunar->unixtime_to_date($date).'<br>';
echo $lunar->get_zodiac_sign(date('m',$date),date('d',$date)).'<br>'; // 计算星座
$date = $lunar->getLar('1900-1-7',0); // 计算农历
//echo date('Y-m-d', $date).'<br>';
echo $lunar->unixtime_to_date($date).'<br>';
echo $lunar->get_animal(date('Y',$date)).'<br>'; // 计算生肖
?>
标签: php 计算阴历、阳历、属性、星座方法
php 查看ssl证书日期
<?php
$domain = "ixex.io";
$g = stream_context_create(array('ssl' => array("capture_peer_cert_chain" => true)));
$r = stream_socket_client("ssl://$domain:443", $errno, $errstr, 30, STREAM_CLIENT_CONNECT, $g);
$cont = stream_context_get_params($r);
foreach($cont["options"]["ssl"]["peer_certificate_chain"] as $key => $val){
//使用openssl扩展解析证书
$cerInfo = openssl_x509_parse($val);
if(strpos($cerInfo['name'], $domain)){
echo "start:".date('Y-m-d', $cerInfo['validFrom_time_t'])."<br>";
echo "end:".date('Y-m-d', $cerInfo['validTo_time_t']);
}
}
php 阴阳历转换
php阴阳历转换类
<?php
/**
* 由于系统原因，对于1970年以前和2038年以后的日期使用mktime()方法溢出，1970年前和2038年后的日期使用DteTime()类处理（此类仅支持php5.3+版本）
* 然后再用相关方法处理数据得到想要的日期格式。
*
* $lunarInfo元素
* $lunarInfo[0]: 农历润月月份
* $lunarInfo[1] 农历正月对应的阳历月份
* $lunarInfo[2] 农历正月初一对应的阳历日
* $lunarInfo[3]：农每月的天数减去29，得到的数就是第四位数的二进制，这个二进制数长度必须是16位，不够16位，后面补0，然后再转换成十进制。
*
**/
class Lunar {
var $MIN_YEAR = 1582;
var $MAX_YEAR = 2135;
var $lunarInfo = array(
array(0,2,4,51792),
array(2,1,24,21232),array(0,2,12,18800),array(9,1,31,25824),array(0,2,18,54432),array(0,2,7,59984),array(6,1,28,15008),
array(0,2,15,22224),array(0,2,5,11104),array(3,1,25,34272),array(0,2,13,37600),array(11,2,1,51568),array(0,2,20,43344),
array(0,2,9,54432),array(8,1,29,55968),array(0,2,16,46416),array(0,2,6,22192),array(4,1,27,11680),array(0,2,14,42448),
array(0,2,3,37584),array(2,1,23,53936),array(0,2,11,43344),array(9,1,31,46288),array(0,2,18,27296),array(0,2,7,44368),
array(6,1,28,22352),array(0,2,16,19360),array(0,2,4,42416),array(3,1,25,17776),array(0,2,13,21168),array(11,2,2,43328),
array(0,2,19,59728),array(0,2,9,27296),array(8,1,29,44448),array(0,2,17,39760),array(0,2,6,19296),array(4,1,26,43744),
array(0,2,14,42224),array(0,2,4,21088),array(2,1,22,53856),array(0,2,10,54608),array(10,1,31,23184),array(0,2,19,22176),
array(0,2,7,38608),array(6,1,28,18896),array(0,2,16,18912),array(0,2,5,42192),array(4,1,24,54480),array(0,2,12,53840),
array(11,2,1,54576),array(0,2,20,46400),array(0,2,8,46496),array(8,1,29,38304),array(0,2,17,38320),array(0,2,7,18864),
array(4,1,26,43376),array(0,2,14,42160),array(0,2,3,43600),array(1,1,23,59984),array(0,2,10,27968),array(11,1,30,44464),
array(0,2,19,11104),array(0,2,8,37744),array(6,1,28,19184),array(0,2,16,18800),array(0,2,5,25776),array(3,1,25,29856),
array(0,2,11,55888),array(11,2,1,27472),array(0,2,20,22224),array(0,2,10,10976),array(7,1,29,37856),array(0,2,17,37600),
array(0,2,6,51552),array(5,1,26,53584),array(0,2,13,54432),array(0,2,2,55888),array(1,1,23,13648),array(0,2,11,22176),
array(10,1,30,42720),array(0,2,18,42448),array(0,2,8,37584),array(6,1,28,43696),array(0,2,15,43344),array(0,2,4,46240),
array(4,1,24,47776),array(0,2,12,44368),array(0,2,1,21920),array(2,1,21,35744),array(0,2,9,42416),array(7,1,30,21360),
array(0,2,17,21168),array(0,2,6,26928),array(5,1,26,29008),array(0,2,14,27296),array(0,2,2,44368),array(3,1,23,23376),
array(0,2,11,19296),array(8,1,31,42464),array(0,2,18,42208),array(0,2,7,53856),array(6,1,27,60000),array(0,2,15,54560),
array(0,2,3,55968),array(4,1,24,26272),array(0,2,12,22224),array(0,2,2,19168),array(3,1,21,43472),array(0,2,9,42192),
array(7,1,29,53936),array(0,2,17,45648),array(0,2,5,54560),array(5,1,25,54592),array(0,2,13,46496),array(0,2,3,21968),
array(3,1,23,21936),array(0,2,11,18864),array(7,1,31,42352),array(0,2,19,42160),array(0,2,8,43600),array(6,1,28,46672),
array(0,2,16,27936),array(0,2,5,44448),array(4,1,25,23392),array(0,2,13,37744),array(0,2,3,18800),array(3,1,23,26992),
array(0,2,10,25776),array(7,1,30,27296),array(0,2,17,55888),array(0,2,7,23200),array(5,1,26,44736),array(0,2,14,43744),
array(0,2,4,37600),array(3,1,24,53984),array(0,2,11,51552),array(8,1,31,54352),array(0,2,19,54432),array(0,2,8,54608),
array(6,1,28,22864),array(0,2,16,22176),array(0,2,5,42720),array(4,1,26,21968),array(0,2,13,21200),array(0,2,2,43344),
array(3,1,22,51536),array(0,2,10,46240),array(7,1,29,46240),array(0,2,17,44368),array(0,2,7,21920),array(5,1,27,41888),
array(0,2,14,42416),array(0,2,4,21168),array(4,1,24,41328),array(0,2,12,26928),array(9,1,31,27312),array(0,2,19,27296),
array(0,2,8,43856),array(6,1,29,20304),array(0,2,16,19296),array(0,2,5,42352),array(4,1,26,21216),array(0,2,13,53600),
array(0,2,1,59696),array(3,1,22,29984),array(0,2,9,55968),array(7,1,30,23200),array(0,2,17,22224),array(0,2,7,19168),
array(5,1,27,41424),array(0,2,15,41680),array(0,2,3,53584),array(4,1,23,55888),array(0,2,11,46368),array(9,1,31,54944),
array(0,2,18,44448),array(0,2,8,21968),array(6,1,29,10672),array(0,2,17,17840),array(0,2,5,41648),array(5,1,25,45744),
array(0,2,13,43344),array(0,2,2,46368),array(2,1,21,43808),array(0,2,9,44384),array(7,1,30,21856),array(0,2,18,37744),
array(0,2,7,17776),array(5,1,27,25968),array(0,2,15,21168),array(0,2,4,26960),array(3,1,23,31056),array(0,2,11,23200),
array(10,1,31,43872),array(0,2,19,42704),array(0,2,8,19168),array(6,1,28,42720),array(0,2,16,42336),array(0,2,5,54432),
array(5,1,24,60064),array(0,2,12,54608),array(0,2,2,23200),array(3,1,22,46752),array(0,2,9,42704),array(7,1,30,19408),
array(0,2,18,19120),array(0,2,7,43216),array(5,1,26,54608),array(0,2,14,45728),array(0,2,3,46416),array(4,1,24,23888),
array(0,2,11,19872),array(0,1,31,38352),array(2,1,21,21872),array(0,2,9,18864),array(6,1,28,43376),array(0,2,16,25776),
array(0,2,5,27280),array(4,1,25,47776),array(0,2,13,27472),array(0,2,3,11168),array(2,1,23,43872),array(0,2,11,37744),
array(6,1,31,21216),array(0,2,18,53600),array(0,2,7,58544),array(5,1,28,27936),array(0,2,14,55952),array(0,2,4,23376),
array(3,1,25,14032),array(0,2,13,10976),array(0,2,1,41696),array(2,1,21,58064),array(0,2,9,51536),array(6,1,29,54608),
array(0,2,16,46368),array(0,2,5,46736),array(4,1,26,23968),array(0,2,14,21968),array(0,2,3,9680),array(3,1,23,42416),
array(0,2,11,25264),array(7,1,31,43184),array(0,2,18,43344),array(0,2,7,46240),array(5,1,27,45728),array(0,2,15,44368),
array(0,2,4,21936),array(4,1,25,11120),array(0,2,13,9584),array(9,2,2,21232),array(0,2,20,21168),array(0,2,9,26960),
array(6,1,29,27984),array(0,2,17,23200),array(0,2,5,43856),array(4,1,26,22224),array(0,2,14,19168),array(0,2,3,42352),
array(3,1,23,17744),array(0,2,10,53920),array(7,1,30,59552),array(0,2,18,54608),array(0,2,7,23200),array(5,1,27,44448),
array(0,2,15,38352),array(0,2,5,19168),array(4,1,24,43696),array(0,2,12,42192),array(8,2,1,53936),array(0,2,20,45712),
array(0,2,8,46416),array(7,1,29,22352),array(0,2,17,11680),array(0,2,6,38352),array(5,1,26,19824),array(0,2,14,18864),
array(0,2,3,42160),array(3,1,23,42160),array(0,2,10,27280),array(8,1,30,44432),array(0,2,18,27472),array(0,2,8,11104),
array(5,1,27,37728),array(0,2,15,37744),array(0,2,5,18800),array(4,1,25,26976),array(0,2,11,58528),array(10,1,31,60000),
array(0,2,19,55952),array(0,2,9,23248),array(6,1,29,10960),array(0,2,17,10976),array(0,2,6,37600),array(5,1,26,51920),
array(0,2,13,51536),array(0,2,2,54432),array(3,1,22,54432),array(0,2,10,46736),array(7,1,30,22432),array(0,2,18,21936),
array(0,2,8,9680),array(5,1,28,38320),array(0,2,15,37552),array(0,2,4,43344),array(4,1,24,55632),array(0,2,12,46240),
array(0,1,31,45392),array(2,1,21,27984),
array(0,2,9,21936),array(6,1,30,9656),array(0,2,17,9584),array(0,2,6,21168),array(5,1,26,43344),array(0,2,13,59728),
array(0,2,2,27296),array(3,1,22,44368),array(0,2,10,43856),array(8,1,30,19304),array(0,2,19,19168),array(0,2,8,42352),
array(5,1,29,21096),array(0,2,16,53856),array(0,2,4,55632),array(4,1,25,27304),array(0,2,13,22176),array(0,2,2,39632),
array(2,1,22,19176),array(0,2,10,19168),array(6,1,30,42200),array(0,2,18,42192),array(0,2,6,53840),array(5,1,26,54568),
array(0,2,14,46400),array(0,2,3,54944),array(2,1,23,38608),array(0,2,11,38320),array(7,2,1,18872),array(0,2,20,18800),
array(0,2,8,42160),array(5,1,28,45656),array(0,2,16,27216),array(0,2,5,27968),array(4,1,24,44456),array(0,2,13,11104),
array(0,2,2,38256),array(2,1,23,18808),array(0,2,10,18800),array(6,1,30,25776),array(0,2,17,54432),array(0,2,6,59984),
array(5,1,26,27976),array(0,2,14,23248),array(0,2,4,11104),array(3,1,24,37744),array(0,2,11,37600),array(7,1,31,51560),
array(0,2,19,51536),array(0,2,8,54432),array(6,1,27,55888),array(0,2,15,46416),array(0,2,5,22176),array(4,1,25,43736),
array(0,2,13,9680),array(0,2,2,37584),array(2,1,22,51544),array(0,2,10,43344),array(7,1,29,46248),array(0,2,17,27808),
array(0,2,6,46416),array(5,1,27,21928),array(0,2,14,19872),array(0,2,3,42416),array(3,1,24,21176),array(0,2,12,21168),
array(8,1,31,43344),array(0,2,18,59728),array(0,2,8,27296),array(6,1,28,44368),array(0,2,15,43856),array(0,2,5,19296),
array(4,1,25,42352),array(0,2,13,42352),array(0,2,2,21088),array(3,1,21,59696),array(0,2,9,55632),array(7,1,30,23208),
array(0,2,17,22176),array(0,2,6,38608),array(5,1,27,19176),array(0,2,15,19152),array(0,2,3,42192),array(4,1,23,53864),
array(0,2,11,53840),array(8,1,31,54568),array(0,2,18,46400),array(0,2,7,46752),array(6,1,28,38608),array(0,2,16,38320),
array(0,2,5,18864),array(4,1,25,42168),array(0,2,13,42160),array(10,2,2,45656),array(0,2,20,27216),array(0,2,9,27968),
array(6,1,29,44448),array(0,2,17,43872),array(0,2,6,38256),array(5,1,27,18808),array(0,2,15,18800),array(0,2,4,25776),
array(3,1,23,27216),array(0,2,10,59984),array(8,1,31,27432),array(0,2,19,23232),array(0,2,7,43872),array(5,1,28,37736),
array(0,2,16,37600),array(0,2,5,51552),array(4,1,24,54440),array(0,2,12,54432),array(0,2,1,55888),array(2,1,22,23208),
array(0,2,9,22176),array(7,1,29,43736),array(0,2,18,9680),array(0,2,7,37584),array(5,1,26,51544),array(0,2,14,43344),
array(0,2,3,46240),array(4,1,23,46416),array(0,2,10,44368),array(9,1,31,21928),array(0,2,19,19360),array(0,2,8,42416),
array(6,1,28,21176),array(0,2,16,21168),array(0,2,5,43312),array(4,1,25,29864),array(0,2,12,27296),array(0,2,1,44368),
array(2,1,22,19880),array(0,2,10,19296),array(6,1,29,42352),array(0,2,17,42208),array(0,2,6,53856),array(5,1,26,59696),
array(0,2,13,54576),array(0,2,3,23200),array(3,1,23,27472),array(0,2,11,38608),array(11,1,31,19176),array(0,2,19,19152),
array(0,2,8,42192),array(6,1,28,53848),array(0,2,15,53840),array(0,2,4,54560),array(5,1,24,55968),array(0,2,12,46496),
array(0,2,1,22224),array(2,1,22,19160),array(0,2,10,18864),array(7,1,30,42168),array(0,2,17,42160),array(0,2,6,43600),
array(5,1,26,46376),array(0,2,14,27936),array(0,2,2,44448),array(3,1,23,21936),array(0,2,11,37744),array(8,2,1,18808),
array(0,2,19,18800),array(0,2,8,25776),array(6,1,28,27216),array(0,2,15,59984),array(0,2,4,27424),array(4,1,24,43872),
array(0,2,12,43744),array(0,2,2,37600),array(3,1,21,51568),array(0,2,9,51552),array(7,1,29,54440),array(0,2,17,54432),
array(0,2,5,55888),array(5,1,26,23208),array(0,2,14,22176),array(0,2,3,42704),array(4,1,23,21224),array(0,2,11,21200),
array(8,1,31,43352),array(0,2,19,43344),array(0,2,7,46240),array(6,1,27,46416),array(0,2,15,44368),array(0,2,5,21920),
array(4,1,24,42448),array(0,2,12,42416),array(0,2,2,21168),array(3,1,22,43320),array(0,2,9,26928),array(7,1,29,29336),
array(0,2,17,27296),array(0,2,6,44368),array(5,1,26,19880),array(0,2,14,19296),array(0,2,3,42352),array(4,1,24,21104),
array(0,2,10,53856),array(8,1,30,59696),array(0,2,18,54560),array(0,2,7,55968),array(6,1,27,27472),array(0,2,15,22224),
array(0,2,5,19168),array(4,1,25,42216),array(0,2,12,42192),array(0,2,1,53584),array(2,1,21,55592),array(0,2,9,54560),
array(7,1,29,55952),array(0,2,7,46496),array(0,2,7,21968),array(5,1,28,19888),array(0,2,15,18864),array(0,2,4,42160),
array(4,1,24,54448),array(0,2,12,43600),array(9,1,31,46416),array(0,2,19,27936),array(0,2,8,44384),array(6,1,29,22368),
array(0,2,16,37744),array(0,2,6,18800),array(4,1,26,26992),array(0,2,14,21680),array(0,2,2,27216),array(3,1,22,31312),
array(0,2,10,27296),array(7,1,30,43680),array(0,2,17,43728),array(0,2,7,21216),array(5,1,27,51936),array(0,2,15,43360),
array(0,2,3,54432),array(4,1,23,58528),array(0,2,11,55632),array(9,2,1,23248),array(0,2,19,22176),array(0,2,8,42704),
array(6,1,29,20944),array(0,2,17,21200),array(0,2,5,43216),array(5,1,25,53584),array(0,2,13,45728),
);
/**
* 将阳历转换为阴历
* @param year 公历-年
* @param month 公历-月
* @param date 公历-日
*/
function convertSolarToLunar($year,$month,$date){
//debugger;
$yearData = $this->lunarInfo[$year-$this->MIN_YEAR];
if($year==$this->MIN_YEAR&&$month<=2&&$date<=4){
return array(1582,'正月','初一','辛卯',1,1,'兔'); //此处对应的年干支不对
}
return $this->getLunarByBetween($year,$this->getDaysBetweenSolar($year,$month,$date,$yearData[1],$yearData[2]));
}
function convertSolarMonthToLunar($year,$month) {
$yearData = $this->lunarInfo[$year-$this->MIN_YEAR];
if($year==$this->MIN_YEAR&&$month<=2&&$date<=4){
return array(1582,'正月','初一','辛卯',1,1,'兔'); //此处对应的年干支不对
}
$month_days_ary = array(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
$dd = $month_days_ary[$month];
if($this->isLeapYear($year) && $month == 2) $dd++;
$lunar_ary = array();
for ($i = 1; $i < $dd; $i++) {
$array = $this->getLunarByBetween($year,$this->getDaysBetweenSolar($year, $month, $i, $yearData[1], $yearData[2]));
$array[] = $year . '-' . $month . '-' . $i;
$lunar_ary[$i] = $array;
}
return $lunar_ary;
}
/**
* 将阴历转换为阳历
* @param year 阴历-年
* @param month 阴历-月，闰月处理：例如如果当年闰五月，那么第二个五月就传六月，相当于阴历有13个月，只是有的时候第13个月的天数为0
* @param date 阴历-日
*/
function convertLunarToSolar($year,$month,$date){
$yearData = $this->lunarInfo[$year-$this->MIN_YEAR];
$between = $this->getDaysBetweenLunar($year,$month,$date);
$res = mktime(0,0,0,$yearData[1],$yearData[2],$year);
$res = date('Y-m-d', $res+$between*24*60*60);
$day = explode('-', $res);
$year = $day[0];
$month= $day[1];
$day = $day[2];
return array($year, $month, $day);
}
/**
* 判断是否是闰年
* @param year
*/
function isLeapYear($year){
return (($year%4==0 && $year%100 !=0) || ($year%400==0));
}
/**
* 获取干支纪年
* @param year
*/
function getLunarYearName($year){
$sky = array('庚','辛','壬','癸','甲','乙','丙','丁','戊','己');
$earth = array('申','酉','戌','亥','子','丑','寅','卯','辰','巳','午','未');
$year = $year.'';
return $sky[$year{3}].$earth[$year%12];
}
/**
* 根据阴历年获取生肖
* @param year 阴历年
*/
function getYearZodiac($year){
$zodiac = array('猴','鸡','狗','猪','鼠','牛','虎','兔','龙','蛇','马','羊');
return $zodiac[$year%12];
}
/**
* 获取阳历月份的天数
* @param year 阳历-年
* @param month 阳历-月
*/
function getSolarMonthDays($year,$month){
$monthHash = array('1'=>31,'2'=>$this->isLeapYear($year)?29:28,'3'=>31,'4'=>30,'5'=>31,'6'=>30,'7'=>31,'8'=>31,'9'=>30,'10'=>31,'11'=>30,'12'=>31);
return $monthHash["$month"];
}
/**
* 获取阴历月份的天数
* @param year 阴历-年
* @param month 阴历-月，从一月开始
*/
function getLunarMonthDays($year,$month){
$monthData = $this->getLunarMonths($year);
return $monthData[$month-1];
}
/**
* 获取阴历每月的天数的数组
* @param year
*/
function getLunarMonths($year){
$yearData = $this->lunarInfo[$year - $this->MIN_YEAR];
$leapMonth = $yearData[0];
$bit = decbin($yearData[3]);
for ($i = 0; $i < strlen($bit);$i ++) {
$bitArray[$i] = substr($bit, $i, 1);
}
for($k=0,$klen=16-count($bitArray);$k<$klen;$k++){
array_unshift($bitArray, '0');
}
$bitArray = array_slice($bitArray,0,($leapMonth==0?12:13));
for($i=0; $i<count($bitArray); $i++){
$bitArray[$i] = $bitArray[$i] + 29;
}
return $bitArray;
}
/**
* 获取农历每年的天数
* @param year 农历年份
*/
function getLunarYearDays($year){
$yearData = $this->lunarInfo[$year-$this->MIN_YEAR];
$monthArray = $this->getLunarYearMonths($year);
$len = count($monthArray);
return ($monthArray[$len-1]==0?$monthArray[$len-2]:$monthArray[$len-1]);
}
function getLunarYearMonths($year){
//debugger;
$monthData = $this->getLunarMonths($year);
$res=array();
$temp=0;
$yearData = $this->lunarInfo[$year-$this->MIN_YEAR];
$len = ($yearData[0]==0?12:13);
for($i=0;$i<$len;$i++){
$temp=0;
for($j=0;$j<=$i;$j++){
$temp+=$monthData[$j];
}
array_push($res, $temp);
}
return $res;
}
/**
* 获取闰月
* @param year 阴历年份
*/
function getLeapMonth($year){
$yearData = $this->lunarInfo[$year-$this->MIN_YEAR];
return $yearData[0];
}
/**
* 计算阴历日期与正月初一相隔的天数
* @param year
* @param month
* @param date
*/
function getDaysBetweenLunar($year,$month,$date){
$yearMonth = $this->getLunarMonths($year);
$res=0;
for($i=1;$i<$month;$i++){
$res +=$yearMonth[$i-1];
}
$res+=$date-1;
return $res;
}
/**
* 计算2个阳历日期之间的天数
* @param year 阳历年
* @param cmonth
* @param cdate
* @param dmonth 阴历正月对应的阳历月份
* @param ddate 阴历初一对应的阳历天数
*/
function getDaysBetweenSolar($year,$cmonth,$cdate,$dmonth,$ddate){
$a = mktime(0,0,0,$cmonth,$cdate,$year);
$b = mktime(0,0,0,$dmonth,$ddate,$year);
return ceil(($a-$b)/24/3600);
}
/**
* 根据距离正月初一的天数计算阴历日期
* @param year 阳历年
* @param between 天数
*/
function getLunarByBetween($year,$between){
//debugger;
$lunarArray = array();
$yearMonth=array();
$t=0;
$e=0;
$leapMonth=0;
$m='';
if($between==0){
array_push($lunarArray, $year,'正月','初一');
$t = 1;
$e = 1;
}else{
$year = $between>0? $year : ($year-1);
$yearMonth = $this->getLunarYearMonths($year);
$leapMonth = $this->getLeapMonth($year);
$between = $between>0?$between : ($this->getLunarYearDays($year)+$between);
for($i=0;$i<13;$i++){
if($between==$yearMonth[$i]){
$t=$i+2;
$e=1;
break;
}else if($between<$yearMonth[$i]){
$t=$i+1;
$e=$between-(empty($yearMonth[$i-1])?0:$yearMonth[$i-1])+1;
break;
}
}
$m = ($leapMonth!=0&&$t==$leapMonth+1)?('闰'.$this->getCapitalNum($t- 1,true)):$this->getCapitalNum(($leapMonth!=0&&$leapMonth+1<$t?($t-1):$t),true);
array_push($lunarArray,$year,$m,$this->getCapitalNum($e,false));
}
array_push($lunarArray,$this->getLunarYearName($year));// 天干地支
array_push($lunarArray,$t,$e);
array_push($lunarArray,$this->getYearZodiac($year));// 12生肖
array_push($lunarArray,$leapMonth);// 闰几月
return $lunarArray;
}
/**
* 获取数字的阴历叫法
* @param num 数字
* @param isMonth 是否是月份的数字
*/
function getCapitalNum($num,$isMonth){
$isMonth = $isMonth || false;
$dateHash=array('0'=>'','1'=>'一','2'=>'二','3'=>'三','4'=>'四','5'=>'五','6'=>'六','7'=>'七','8'=>'八','9'=>'九','10'=>'十 ');
$monthHash=array('0'=>'','1'=>'正月','2'=>'二月','3'=>'三月','4'=>'四月','5'=>'五月','6'=>'六月','7'=>'七月','8'=>'八月','9'=>'九月','10'=>'十月','11'=>'冬月','12'=>'腊月');
$res='';
if($isMonth){
$res = $monthHash[$num];
}else{
if($num<=10){
$res = '初'.$dateHash[$num];
}else if($num>10&&$num<20){
$res = '十'.$dateHash[$num-10];
}else if($num==20){
$res = "二十";
}else if($num>20&&$num<30){
$res = "廿".$dateHash[$num-20];
}else if($num==30){
$res = "三十";
}
}
return $res;
}
}
$year = 2101;
$month = 1;
$day = 30;
$lunar = new Lunar();
$yangli = $lunar->convertLunarToSolar($year,$month,$day);
echo '<pre>';
print_r($yangli);
$nongli = $lunar->convertSolarToLunar($year, $month, $day);
print_r($yangli);
百度发现一篇不一样的文章：https://blog.csdn.net/hsd2012/article/details/51701640
PHP DateTime类解决1970年前和2038年后Unix时间戳与日期互转
解决基于32位系统关于1970年前和2038年后时间戳溢出的问题。
<?php
//1970年以前和2038年以后的Unix时间戳转日期
function unixtime_to_date($unixtime, $timezone = 'PRC') {
$datetime = new DateTime("@$unixtime"); //DateTime类的bug，加入@可以将Unix时间戳作为参数传入
$datetime->setTimezone(new DateTimeZone($timezone));
return $datetime->format("Y-m-d H:i:s");
}
//1970年以前和2038年以后的日期转Unix时间戳
function date_to_unixtime($date, $timezone = 'PRC') {
$datetime= new DateTime($date, new DateTimeZone($timezone));
return $datetime->format('U');
}
echo date_to_unixtime("2038-3-05 00:00:00");
echo '<br>';
echo unixtime_to_date(date_to_unixtime('2038-03-06 00:00:00'));
标签: php DateTime 1970年前和2038年后
PHP DateTime中常用的方法
1、 输出当前时间：
<?php
$datetime = new DateTime();
echo $datetime->format('Y-m-d H:i:s');
2、输出给定的时间：
<?php
$datetime = new DateTime('2038-03-18');
echo $datetime;
3、根据给定的时间格式化为自己想要的时间：
<?php
$datetime = DateTime::createFromFormat('Ymd','20380318');
echo $datetime->format('Y-m-d');
4、输出Unix时间戳格式（方法1如果是1990年以前的会返回负数，而方法2则会返回false）：
<?php
// 方法1(php5.2)：
$datetime = new DateTime();
echo $datetime->format('U');
// 方法2(php5.3)推荐
$datetime = new DateTime();
echo $datetime->getTimestamp();
5、根据给定的时间戳格式化为给定的时间：
<?php
$datetime = new DateTime();
$datetime->setTimestamp(1465783744);
echo $datetime->format('Y-m-d H:i:s');
6、两个日期时间比对,年与年比对，月与月比对：
<?php
$datetime1 = new DateTime('2038-01-15 10:11:18');
$datetime2 = new DateTime('2038-03-05 22:21:21');
$interval = $datetime1->diff($datetime2);
echo $interval->format('%Y');
// %表示使用格式化，R表示是大于这个日期(+)，还是小于这个日期（-）,a表示大于或小于多少天，时分秒正常使用y,m,d,h,i,s
7、创建长度为几天前的时间：
DateInterval构造函数的参数是一个表示时间间隔约定的字符串，这个时间间隔约定以字母P开头，后面跟着一个整数，最后是一个周期标识符，限定前面的整数。有效周期标识符如下： Y（年） M（月） D（日） W（周） H（时） M（分） S（秒） 间隔约定中既可以有时间也可以有日期，如果有时间需要在日期和时间之间加上字母T，例如，间隔约定P2D表示间隔两天，间隔约定P2DT5H2M表示间隔两天五小时两分钟。
<?php
$datetime = new DateTime();
$interval = new DateInterval('P2DT5H');
// 或者使用createFromDateString方法
// $interval = DateInterval::createFromDateString('1 month');
// 修改DateTime实例
$datetime->add($interval);
echo $datetime->format('Y-m-d H:i:s');
8、创建几天前的时间：
<?php
$datetime = new DateTime();
$interval = new DateInterval('P2DT5H');
$datetime->sub($interval);
echo $datetime->format('Y-m-d H:i:s');
// ps:有个modify方法，这个方法是减去30，并不是像前推1天，输出的还是12月
$datetime = new DateTime('2014/12/31');
$datetime->modify('-1 month');
9、重置当前的DateTime对象的时间不同的日期，传递年，月，日：
<?php $datetime = new DateTime(); $datetime->setDate(2038, 3, 5);
10、重置当前的DateTime对象的时间不同的时间，传递时，分，秒（可选参数）：
<?php
$datetime = new DateTime();
$datetime->setTime(20, 20, 24);
echo $datetime->format('Y-m-d H:i:s');
11、格式化时间前更改时间的时区：
<?php
$timezone = new DateTimeZone('Asia/Shanghai');
$datetime = new DateTime();
$datetime->setTimezone($timezone);
echo $datetime->format('Y-m-d H:i:s');
12、返回时区：
<?php
$date = new DateTime(null, newDateTimeZone('Asia/Shanghai'));
$tz = $date->getTimezone();
echo $tz->getName();
13、计算两个时区的偏移值：
<?php
$dateTimeZoneTaipei = new DateTimeZone("Asia/Shanghai");
$dateTimeZoneJapan = new DateTimeZone("Asia/Tokyo");
$dateTimeTaipei = new DateTime("now", $dateTimeZoneTaipei);
$dateTimeJapan = new DateTime("now", $dateTimeZoneJapan);
$timeOffset = $dateTimeZoneJapan->getOffset($dateTimeTaipei);
echo $timeOffset;
14、返回时间间隔，多长时间：
<?php
$interval = new DateInterval('P2Y4DT6H8M');
echo $interval->format('%d days');
15、迭代输出距离当前日期的前几天日期：
DatePeriod类的构造方法接受三个参数而且都必须提供 一个DateTime实例，表示迭代开始的日期和时间 一个DateInterval实例，表示下一个日期和时间的间隔 一个整数，表示迭代的总次数 第四个参数是可选的，用于显式指定周期的结束日期和时间，如果迭代时想要排除开始日期和时间，可以把构造方法的最后一个参数设为DatePeriod::EXCLUDE_START_DATE常量：
<?php
$datetime = new DateTime();
$interval = DateInterval::createFromDateString('-1 day');
$period = new DatePeriod($datetime,$interval, 3);
foreach ($period as$date) {
echo$date->format('Y-m-d'), PHP_EOL;
}
标签: php DateTime常用函数
php mktime溢出
<?php
$y = 2038;
$m = 3;
$d = 5;
$h = 1;
$f = 24;
$times=mktime($h,$f,0,$m,$d,$y);
$timed=date("Y-m-d H:i:s",$times);
echo '$y:'.$y.'<br>$m:'.$m.'<br>$d:'.$d.'<br>$h:'.$h.'<br>$f:'.$f.'<br>';
echo $timed;
输出结果：
$y:2038 $m:3 $d:5 $h:1 $f:24 1970-01-01 08:00:00
在使用mktime()之后，结果是1970年，也就是溢出了。
原因：
一个整型的变量所能保存的最大时间为 2038 年01月19 日 03:14:07。超过这个时间后，整型数值将会溢出。
从 1970 年 01 月 01 日开始，到世界标准时 2038 年 01 月 19 日星期二凌晨 03:14:07 超过 2^31 – 1。
2^31 – 1 就是0x7FFFFFFF，相信很多编程员都看过，在 32 位系统里，这表示最大的有符号整数。
如果用它来表示秒数，大概相当于 68.1 年，从 1970 年到 2038 年刚好是这个数。
PHP5.2以后的版本中引入了DateTime类：
<?php
$date = '2038-3-5';
$format = 'Y-m-d H:i';
$mydate2 = new DateTime($date);
echo '<p>正常时间:'.$mydate2->format($format).'</p>';
echo '时间溢出：'.date('Y-m-d H:i',strtotime($date));
参考链接：https://www.yuzhe.name/library/item-176.html
负数二进制与十进制之间的转换
负数十进制转换成二进制方法：
<?php //负数十进制转换成二进制 以-61为例 //先算出61的二进制（原码）： 0011 1101 //再取反（反码）： 1100 0010 //然后再加1得到补码： 1100 0011 //即-61的二进制位 1100 0011
负数二进制转换成十进制的方法：
<?php //以负数的二进制求负数的十进制 以 1100 0011 为例 //原码 ： 1100 0011 //再减去1： 1100 0010 //然后取反码： 0011 1101 //最后转换成十进制： 0*2^7+0*2^6+1*2^5+1*2^4+1*2^3+1*2^2+0*2^2+1*2^0 = 61 即 -61
标签: 负数二进制转换十进制