( int seconds )
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 php.ini.
If seconds is set to zero, no time limit is
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.
set_time_limit() has no effect when PHP is
running in 安全模式. There is no workaround other than turning
off safe mode or changing the time limit in the php.ini.
The set_time_limit() 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(), stream
operations, database queries, etc. is not included when determining the
maximum time that the script has been running.
See also: max_execution_time and max_input_time ini directives.