<?php
/*
http://php.net/manual/en/function.socket-create-listen.php
Return Values
socket_create_listen() returns a new socket resource on success or FALSE on error. The error code can be retrieved with socket_last_error(). This code may be passed to socket_strerror() to get a textual explanation of the error.
*/
$failure = '1111';
var_export(socket_create_listen($failure));
var_export(socket_last_error());
Fatal error: Uncaught Error: Call to undefined function socket_create_listen() in /in/hSqKg:11
Stack trace:
#0 {main}
thrown in /in/hSqKg on line 11
Process exited with code 255.