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<?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 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
array(1) { [0]=> int(42) }

preferences:
90.45 ms | 402 KiB | 91 Q