3v4l.org

run code in 300+ PHP versions simultaneously
<?php function test(){} //const CONFIG = [ // 'pdo' => new PDO //]; define('CONFIG', [ 'pdo' => test() ]); var_dump(CONFIG['pdo']);
Output for 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, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
NULL
Output for 5.6.8 - 5.6.28
Warning: Constants may only evaluate to scalar values in /in/FTAcU on line 11 Notice: Use of undefined constant CONFIG - assumed 'CONFIG' in /in/FTAcU on line 13 Warning: Illegal string offset 'pdo' in /in/FTAcU on line 13 string(1) "C"
Output for 5.5.24 - 5.5.35
Parse error: syntax error, unexpected '[' in /in/FTAcU on line 13
Process exited with code 255.
preferences:
218.03 ms | 401 KiB | 226 Q