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run code in 300+ PHP versions simultaneously
<?php function inc(&$a, &$b) { ++$a; ++$b; } $a = 1; $b = 1; $params = array($a, &$b); call_user_func_array('inc', $params); var_dump($params);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Warning: inc(): Argument #1 ($a) must be passed by reference, value given in /in/jd9Nd on line 10 array(2) { [0]=> int(1) [1]=> &int(2) }
Output for 7.1.0 - 7.1.20, 7.2.6 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33
Warning: Parameter 1 to inc() expected to be a reference, value given in /in/jd9Nd on line 10 array(2) { [0]=> int(1) [1]=> &int(2) }
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20
Warning: Parameter 1 to inc() expected to be a reference, value given in /in/jd9Nd on line 10 array(2) { [0]=> int(1) [1]=> &int(1) }
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
array(2) { [0]=> int(1) [1]=> &int(2) }

preferences:
263.23 ms | 402 KiB | 310 Q