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run code in 150+ php & hhvm versions
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<?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 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
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(42) }
Output for 5.0.0 - 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(42) }
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected '&', expecting T_VARIABLE or '$' in /in/NWs6j on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected '&', expecting T_VARIABLE or '$' in /in/NWs6j 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/NWs6j on line 5
Process exited with code 255.