3v4l.org

run code in 300+ PHP versions simultaneously
<?php $search = 'Hello world.'; $test = 'world'; $pos = strpos($search, $test); echo $pos; if (!$pos) echo "1. Not found"; else echo "1. Found"; echo "\r\n"; if ($pos != true) echo "2. Not found"; else echo "2. Found"; echo "\r\n"; if ($pos === false) echo "3. Not found"; else echo "3. Found"; echo "\r\n"; if ($pos == false) echo "4. Not found"; else echo "4. Found"; ?>
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
61. Found 2. Found 3. Found 4. Found
preferences:
249.64 ms | 404 KiB | 331 Q