PHP中实现crontab代码分享
发布:smiling 来源: PHP粉丝网 添加日期:2021-05-18 20:26:53 浏览: 评论:0
这篇文章主要介绍了PHP中实现crontab代码分享,本文给出了实现代码和使用方法,需要的朋友可以参考下。
1. 准备一个标准crontab文件 ./crontab:
# m h dom mon dow command
* * * * * date > /tmp/cron.date.run
2. crontab -e 将此cron.php脚本加入系统cron,代码如下:
* * * * * /usr/bin/php cron.php
3. cron.php 源码:
- // 从./crontab读取cron项,也可以从其他持久存储(mysql、redis)读取
- $crontab = file('./crontab');
- $now = $_SERVER['REQUEST_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 ) 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;
- }
- }
- /* https://github.com/jkonieczny/PHP-Crontab */
- class Crontab {
- /**
- * Finds next execution time(stamp) parsin crontab syntax,
- * after given starting 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 $_after_timestamp timestamp [default=current timestamp]
- * @return int unix timestamp - next execution time will be greater
- * than given timestamp (defaults to the current timestamp)
- * @throws InvalidArgumentException
- */
- public static function parse($_cron_string,$_after_timestamp=null)
- {
- if(!preg_match('/^((\*(\/[0-9]+)?)|[0-9\-\,\/]+)\s+((\*(\/[0-9]+)?)|[0-9\-\,\/]+)\s+((\*(\/[0-9]+)?)|[0-9\-\,\/]+)\s+((\*(\/[0-9]+)?)|[0-9\-\,\/]+)\s+((\*(\/[0-9]+)?)|[0-9\-\,\/]+)$/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 valid unix timestamp ($_after_timestamp given)");
- }
- $cron = preg_split("/[\s]+/i",trim($_cron_string));
- $start = emptyempty($_after_timestamp)?time():$_after_timestamp;
- $date = array( 'minutes' =>self::_parseCronNumbers($cron[0],0,59),
- 'hours' =>self::_parseCronNumbers($cron[1],0,23),
- 'dom' =>self::_parseCronNumbers($cron[2],1,31),
- 'month' =>self::_parseCronNumbers($cron[3],1,12),
- 'dow' =>self::_parseCronNumbers($cron[4],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+$i)),$date['dom']) &&
- in_array(intval(date('n',$start+$i)),$date['month']) &&
- in_array(intval(date('w',$start+$i)),$date['dow']) &&
- in_array(intval(date('G',$start+$i)),$date['hours']) &&
- in_array(intval(date('i',$start+$i)),$date['minutes'])
- ){
- 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
- * @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);
- $step = emptyempty($vvv[1])?1:$vvv[1];
- $vvvv = explode('-',$vvv[0]);
- $_min = count($vvvv)==2?$vvvv[0]:($vvv[0]=='*'?$min:$vvv[0]);
- $_max = count($vvvv)==2?$vvvv[1]:($vvv[0]=='*'?$max:$vvv[0]);
- for($i=$_min;$i<=$_max;$i+=$step){
- $result[$i]=intval($i);
- }
- }
- ksort($result);
- return $result;
- }
- }
Tags: crontab
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