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<?php function refArray($arr) { return $refs; } $arr = [3, "hello", 0.8, null]; $refs = []; foreach ($arr as $key => $value) $refs[$key] = &$arr[$key]; $copy = $arr; var_dump($arr); var_dump($refs); var_dump($copy);
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
array(4) { [0]=> &int(3) [1]=> &string(5) "hello" [2]=> &float(0.8) [3]=> &NULL } array(4) { [0]=> &int(3) [1]=> &string(5) "hello" [2]=> &float(0.8) [3]=> &NULL } array(4) { [0]=> &int(3) [1]=> &string(5) "hello" [2]=> &float(0.8) [3]=> &NULL }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/DpBS2 on line 7
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/DpBS2 on line 7
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/DpBS2 on line 7
Process exited with code 255.

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