Implement crontab code sharing in PHP, Phpcrontab code sharing _php Tutorials

Implement crontab code sharing in PHP, Phpcrontab code sharing

1. Prepare a standard crontab file./crontab
Copy the Code code as follows:
# m H Dom Mon Dow command
* * * * * date >/tmp/cron.date.run

2. Crontab-e this cron.php script into the system cron

Copy the Code code as follows:
* * * * * */usr/bin/php cron.php

3. cron.php Source Code

Copy the Code code as follows:
Read cron items from./crontab, or read from other persistent storage (MySQL, Redis)
$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);
$next _time = Crontab::p arse ($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 $_after_timestamp timestamp [default=current timestamp]
* @return int Unix Timestamp-next execution time would be greater
* Than given timestamp (defaults to the current timestamp)
* @throws InvalidArgumentException
*/
public static function Parse ($_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));
$start = Empty ($_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 (' 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);
$step = Empty ($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;
}
}

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