3v4l.org

run code in 300+ PHP versions simultaneously
<?php $content = <<<CONTENT @tag CONTENT; $matches = array(); var_dump(preg_match('/\n\w*@/', $content, $matches, null, 1) === 1);
Output for 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Deprecated: preg_match(): Passing null to parameter #4 ($flags) of type int is deprecated in /in/6H4LD on line 8 bool(false)
Output for 4.3.3 - 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, 5.5.0 - 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
bool(false)
Output for 4.3.0 - 4.3.2
Warning: Wrong parameter count for preg_match() in /in/6H4LD on line 8 bool(false)

preferences:
331.96 ms | 401 KiB | 455 Q