PHP中實現(xiàn)crontab代碼分享_

1、PHP中實現(xiàn)crontab代碼分享_ 這篇文章主要介紹了PHP中實現(xiàn)crontab代碼分享,本文給出了實現(xiàn)代碼和用法方法,需要的伴侶可以參考下 1. 預(yù)備一個標(biāo)準(zhǔn)crontab文件 ./crontab 代碼如下: # m h dom mon dow command * * * * * date /tmp/cron.date.run 2. crontab -e 將此cron.php腳本加入系統(tǒng)cron 代碼如下: * * * * * /usr/bin/php cron.php 3. cron.php 源碼 代碼如下: / 從./crontab讀取cron項，也可以從其他長久存儲（mysql、re

2、dis）讀取 $crontab = file(./crontab); $now = $_SERVERREQUEST_TIME; foreach ( $crontab as $cron ) $slices = preg_split(/s+/, $cron, 6); if( count($slices) != 6 ) continue; $cmd = array_pop($slices); $cron_time = implode( , $slices); $next_time = Crontab:parse($cron_time, $now); if ( $next_time != $now )

3、 continue; $pid = pcntl_fork(); if ($pid = -1) die(could not fork); else if ($pid) / we are the parent pcntl_wait($status, WNOHANG); /Protect against Zombie children else / we are the child $cmd; exit; /* */ class Crontab /* * Finds next execution time(stamp) parsin crontab syntax, * after given sta

4、rting timestamp (or current time if ommited) * * param string $_cron_string: * * 0 1 2 3 4 * * * * * * * - - - - - * | | | | | * | | | | +- day of week (0 - 6) (Sunday=0) * | | | +- month (1 - 12) * | | +- day of month (1 - 31) * | +- hour (0 - 23) * +- min (0 - 59) * param int $_after_timestamp tim

5、estamp default=current timestamp * return int unix timestamp - next execution time will be greater * than given timestamp (defaults to the current timestamp) * throws InvalidArgumentException */ public static function parse($_cron_string,$_after_timestamp=null) if(!preg_match(/(*(/0-9+)?)|0-9-,/+)s+

6、(*(/0-9+)?)|0-9-,/+)s+(*(/0-9+)?)|0-9-,/+)s+(*(/0-9+)?)|0-9-,/+)s+(*(/0-9+)?)|0-9-,/+)$/i,trim($_cron_string) throw new InvalidArgumentException(Invalid cron string: .$_cron_string); if($_after_timestamp !is_numeric($_after_timestamp) throw new InvalidArgumentException($_after_timestamp must be a va

7、lid unix timestamp ($_after_timestamp given); $cron = preg_split(/s+/i,trim($_cron_string); $start = empty($_after_timestamp)?time():$_after_timestamp; $date = array( minutes =self:_parseCronNumbers($cron0,0,59), hours =self:_parseCronNumbers($cron1,0,23), dom =self:_parseCronNumbers($cron2,1,31), m

8、onth =self:_parseCronNumbers($cron3,1,12), dow =self:_parseCronNumbers($cron4,0,6), ); / limited to time()+366 - no need to check more than 1year ahead for($i=0;$i=60*60*24*366;$i+=60) if( in_array(intval(date(j,$start+$i),$datedom) in_array(intval(date(n,$start+$i),$datemonth) in_array(intval(date(

9、w,$start+$i),$datedow) in_array(intval(date(G,$start+$i),$datehours) in_array(intval(date(i,$start+$i),$dateminutes) ) return $start+$i; return null; /* * get a single cron style notation and parse it into numeric value * * param string $s cron string element * param int $min minimum possible value

10、* param int $max maximum possible value * return int parsed number */ protected static function _parseCronNumbers($s,$min,$max) $result = array(); $v = explode(,$s); foreach($v as $vv) $vvv = explode(/,$vv); $step = empty($vvv1)?1:$vvv1; $vvvv = explode(-,$vvv0); $_min = count($vvvv)=2?$vvvv0:($vvv0=*?$min:$vvv0