PHP provides the alternate function which can control time limit that defined in php.ini. Following is the alternate function can control time limit.
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
seconds or, if it exists, the max_execution_time value defined in the
configuration file. If seconds is set to zero, no time limit is imposed.
When called, set_time_limit() 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.
Note that set_time_limit() 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 configuration file.
This function sets whether a client disconnect should cause a script to
be aborted. It will return the previous setting and can be called
without an argument to not change the current setting and only return
the current setting.