3v4l.org

run code in 300+ PHP versions simultaneously
<?php function tester( array &$error ) { $error = [ 'text' => 'nothing found' ]; return true; } $e = null; $error = []; $error[] =& $e; call_user_func( 'tester', $error ); var_dump( $error );
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.29, 8.2.0 - 8.2.23, 8.3.0 - 8.3.11
Warning: tester(): Argument #1 ($error) must be passed by reference, value given in /in/84v2o on line 12 array(1) { [0]=> &NULL }
Output for 5.5.0 - 5.5.36, 5.6.0 - 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
Warning: Parameter 1 to tester() expected to be a reference, value given in /in/84v2o on line 12 array(1) { [0]=> &NULL }
preferences:
88.57 ms | 408 KiB | 5 Q