3v4l.org

run code in 500+ PHP versions simultaneously
<?php function assign_by_ref(&$ref) { $ref = 42; } $a = []; assign_by_ref($a[]); var_dump($a);
Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.22, 8.5.0 - 8.5.7
array(1) { [0]=> int(42) }

preferences:
78.54 ms | 1115 KiB | 4 Q