apache_child_terminate() will register the Apache process executing the current PHP request for termination once execution of PHP code it is completed. It may be used to terminate a process after a script with high memory consumption has been run as memory will usually only be freed internally but not given back to the operating system.
Note: The availability of this feature is controlled by the php.ini directive child_terminate, which is set to off by default.
This function is only available in non-multithreaded versions of Apache 1, with PHP running as Apache module.
Note: This function is not implemented on Windows platforms.
See also exit().