3v4l.org

run code in 300+ PHP versions simultaneously

sponsor
bughunt
search
recent
about

@ 2018-10-11T16:33:58Z

<?php

	$f = fopen("lock", "w") or die("Cannot create lock file.");

	if(!flock($f, LOCK_EX | LOCK_NB)) {
		print ("Exiting due to duplicated instance.");
		exit();
	}

	
	print("1");
	sleep(20);

Output
Performance
VLD
References
Branches

flock: documentation ( source)
sleep: documentation ( source)
fopen: documentation ( source)

preferences:dark modelive preview

54.2 ms | 402 KiB | 5 Q