3v4l.org

run code in 300+ PHP versions simultaneously
<?php function wer(&$x) { print_r($x); $x[0] = 'ttt'; } $e = 'ert'; call_user_func('wer', [&$e]); print_r($e);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
Warning: wer(): Argument #1 ($x) must be passed by reference, value given in /in/g2b9p on line 7 Array ( [0] => ert ) ttt
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Warning: wer(): Argument #1 ($x) must be passed by reference, value given in /in/g2b9p on line 7 Array ( [0] => ert ) ttt
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Warning: Parameter 1 to wer() expected to be a reference, value given in /in/g2b9p on line 7 Array ( [0] => ert ) ttt
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33
Array ( [0] => ert ) ttt

preferences:
190.78 ms | 402 KiB | 291 Q