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<?php $foo = ["baz" => 42]; function modify($a) { global $foo; var_dump($a === $foo); $a['hello'] = "world"; var_dump($a === $foo); } modify($foo); var_dump($foo);
Output for 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 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.13
bool(true) bool(false) array(1) { ["baz"]=> int(42) }

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105.43 ms | 407 KiB | 5 Q