How to disable ctrl-z, ctrl-c from breaking out of a php script

Question

Can someone point me in the correct direction for researching how to prevent users from breaking out of a php script with Ctrl+Z, Ctrl+C?

Answer 1

If you have php compiled with PCNTL (Process Control) and are not running Windows you can use pcntl_signal().

There is an example here which I modified, and it seems to catch Ctrl-C ok:

<?php
declare(ticks = 1);

pcntl_signal(SIGINT, "signal_handler");

function signal_handler($signal) {
    switch($signal) {
        case SIGINT:
            print "Ctrl C\n";
    }
}

while(1) {

}

If you try to install a handler for SIGSTP nothing happens, but I don't know why.