How to make a script run for a maximum of "x" number of hours only

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LEARN ABOUT PHP

set_time_limit

SET_TIME_LIMIT(3)							 1							 SET_TIME_LIMIT(3)

set_time_limit - Limits the maximum execution time

SYNOPSIS

       bool set_time_limit (int  $seconds)

DESCRIPTION

	Set  the  number of seconds a script is allowed to run. If this is reached, the script returns a fatal error. The default limit is 30 sec-
       onds or, if it exists, the max_execution_time value defined in the php.ini.

	When called, set_time_limit(3) restarts the timeout counter from zero. In other words, if the timeout is the default 30  seconds,  and	25
       seconds into script execution a call such as set_time_limit(20) is made, the script will run for a total of 45 seconds before timing out.

PARAMETERS

	      o $seconds
		- The maximum execution time, in seconds. If set to zero, no time limit is imposed.

RETURN VALUES

	Returns TRUE on success, or FALSE on failure.

NOTES

       Warning

	       This  function  has no effect when PHP is running in safe mode. There is no workaround other than turning off safe mode or changing
	      the time limit in the php.ini.

       Note

	       The set_time_limit(3) function and the configuration directive max_execution_time only affect the  execution  time  of  the  script
	      itself.  Any  time  spent  on activity that happens outside the execution of the script such as system calls using system(3), stream
	      operations, database queries, etc. is not included when determining the maximum time that the script has been running. This  is  not
	      true on Windows where the measured time is real.

SEE ALSO

       max_execution_time, max_input_time.

PHP Documentation Group 													 SET_TIME_LIMIT(3)

Shell Programming and Scripting