3v4l.org

run code in 300+ PHP versions simultaneously
<?php function f($a, &$b, &$c) { var_dump($a); $b++; $c--; } $ref_a = 10; $ref_b = 10; $arr = array('a', &$ref_a, &$ref_b); call_user_func_array('f', $arr); var_dump($arr);
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, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 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
string(1) "a" array(3) { [0]=> string(1) "a" [1]=> &int(11) [2]=> &int(9) }
preferences:
313.95 ms | 406 KiB | 460 Q