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run code in 300+ PHP versions simultaneously
<?php $array = array(1, 1, 2, 3, 5); foreach ($array as &$value) { $value *= $value; } unset($value); var_dump($array); $value = 42; var_dump($array);
Output for 5.2.1 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.26, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.12 - 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(5) { [0]=> int(1) [1]=> int(1) [2]=> int(4) [3]=> int(9) [4]=> int(25) } array(5) { [0]=> int(1) [1]=> int(1) [2]=> int(4) [3]=> int(9) [4]=> int(25) }
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0
array(5) { [0]=> &int(1) [1]=> &int(1) [2]=> &int(4) [3]=> &int(9) [4]=> int(25) } array(5) { [0]=> &int(1) [1]=> &int(1) [2]=> &int(4) [3]=> &int(9) [4]=> int(25) }
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected '&', expecting T_VARIABLE or '$' in /in/QU4G0 on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
Parse error: parse error, unexpected '&', expecting T_VARIABLE or '$' in /in/QU4G0 on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_VARIABLE' or `'$'' in /in/QU4G0 on line 5
Process exited with code 255.

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