3v4l.org

run code in 300+ PHP versions simultaneously
<?php $config = array( 'key' => array( '/chat/index/post/' => '/chat/') ); foreach ($config['key'] as $url => $key) { $quoted = preg_quote($url, '/'); if (null !== $res = preg_replace('/' . $quoted . '/', $key, $dataKey)) { echo $res; } }
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Warning: Undefined variable $dataKey in /in/MneeP on line 7 Deprecated: preg_replace(): Passing null to parameter #3 ($subject) of type array|string is deprecated in /in/MneeP on line 7
Output for 8.0.0 - 8.0.30
Warning: Undefined variable $dataKey in /in/MneeP on line 7
Output for 5.5.0 - 5.5.35, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.12 - 7.3.31, 7.4.0 - 7.4.33
Notice: Undefined variable: dataKey in /in/MneeP on line 7
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, 7.3.32 - 7.3.33
preferences:
221.82 ms | 403 KiB | 343 Q