3v4l.org

run code in 300+ PHP versions simultaneously
<?php declare(strict_types=1); function foo(string $bar = null) { var_dump($bar); } foo('');
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 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 - 8.3.6
string(0) ""
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Warning: Unsupported declare 'strict_types' in /in/n99Qv on line 1 Catchable fatal error: Argument 1 passed to foo() must be an instance of string, string given, called in /in/n99Qv on line 7 and defined in /in/n99Qv on line 3
Process exited with code 255.
preferences:
145.53 ms | 402 KiB | 183 Q