PHP execution time - prevent Apache from stopping script

Question

I am trying to get a PHP script under local Linux Apache running without getting stopped by Apache. I am using PHP 5.5.9-1ubuntu4.4, Apache/2.4.7 (Ubuntu), Ubuntu 14.04 LTS 64-bit. What I did so far:

In my PHP script:

ignore_user_abort(true);
set_time_limit(0);
...
foreach(...) {
    ...
    // inside loop
    usleep(1000);
    ...
}

In all php.ini:

max_execution_time=3600;

Nothing of the above helped. The script stops after ~30sec. Im out of ideas. Is it possible that my script gets shut down because it runs out of memory? Best way to check that?

EDIT:

Through adding "ini_set('display_errors', 1);" I got the error Allowed memory size of 134217728 bytes exhausted. So it is about memory, thanks for the hint how to check that.

SOLUTION:

The underlying problem turned out to be the usage of 'foreach' loops. After switching all 'foreach' loops to 'for' loops the memory usage got more stable.

Answer 1

To see what's causing the script to stop, add the following to the top of the page:

<?php
error_reporting(E_ALL);
ini_set('display_errors', 1);
?>