3v4l.org

run code in 300+ PHP versions simultaneously
<?php $matches=null; $fortune = 'The rain in Spain<br> -- whoknows?'; if (strpos($fortune,"--") !== FALSE) { preg_replace("/(--[ a-zA-Z]+)/m","<p style='text-align:right'>$1</p>",$matches); var_dump($matches); }
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
Deprecated: preg_replace(): Passing null to parameter #3 ($subject) of type array|string is deprecated in /in/Hk0Mk on line 5 NULL
Output for 4.3.0 - 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, 7.0.0 - 7.0.20, 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
NULL
preferences:
232.89 ms | 405 KiB | 358 Q