PHP uses the process as a daemon process php process daemon process

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It means that the process that calls this function between a process group (parent process and child process) will be elected as the leader of the process group

So the way to make a process a daemon is:

1 fork a child process

2 in the child process posix_setsid()

3 Exit the parent process

There is such an example in the documentation:

<?php $pid = pcntl_fork(); // fork if ($pid <0) exit; else if ( $pid) // parent exit; else { // child $sid = posix_setsid(); if ($sid <0) exit; for($i = 0; $i