Crontab code sharing in PHP and phpcrontab code sharing _ PHP Tutorial

PHP implements crontab code sharing and phpcrontab code sharing. PHP implements crontab code sharing, and phpcrontab code sharing 1. prepare a standard crontab file. the crontab copy code is as follows: # mhdommondowcommand ***** datetmpcron. crontab code sharing and phpcrontab code sharing in PHP

1. prepare a standard crontab file./crontab
The code is as follows:
# M h dom mon dow command
* *** Date>/tmp/cron. date. run

2. crontab-e add the cron. php script to the system cron.

The code is as follows:
* ***/Usr/bin/php cron. php

3. cron. php source code

The code is as follows:
// Read cron entries from./crontab or from other persistent storage (mysql or 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: 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 = empty ($ _ after_timestamp )? Time (): $ _ after_timestamp;

$ Date = array ('minutes '=> self: _ parseCronNumbers ($ cron [0 ),
'Hours' => self: _ parseCronNumbers ($ cron [1 ),
'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 1 year 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 = 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;
}
}

Prepare 1. prepare a standard crontab file./crontab code: # m h dom mon dow command ***** date/tmp/cron ....