3v4l.org

run code in 300+ PHP versions simultaneously
<?php $b = 'echo "OK";'; $a='f();function f($_=1){if($_==1)return;'.$b.'}'; assert($a); f(2);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught Error: Call to undefined function f() in /in/nHBO4:6 Stack trace: #0 {main} thrown in /in/nHBO4 on line 6
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.12 - 7.3.31, 7.4.0 - 7.4.33
Deprecated: assert(): Calling assert() with a string argument is deprecated in /in/nHBO4 on line 5 Warning: assert(): assert($a): "f();function f($_=1){if($_==1)return;echo "OK";}" failed in /in/nHBO4 on line 5 OK
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.3.32 - 7.3.33
Warning: assert(): assert($a): "f();function f($_=1){if($_==1)return;echo "OK";}" failed in /in/nHBO4 on line 5 OK
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28
Warning: assert(): Assertion "f();function f($_=1){if($_==1)return;echo "OK";}" failed in /in/nHBO4 on line 5 OK
Output for 4.3.0 - 4.3.1
Warning: assert() [http://www.php.net/function.assert]: Assertion "f();function f($_=1){if($_==1)return;echo "OK";}" failed in /in/nHBO4 on line 5 OK

preferences:
222.08 ms | 401 KiB | 315 Q