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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); array_walk($array, function(&$value, &$key) { $value *= $value; }); var_dump($array);
Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
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) } Warning: {closure}(): Argument #2 ($key) must be passed by reference, value given in /in/fdoN7 on line 18 Warning: {closure}(): Argument #2 ($key) must be passed by reference, value given in /in/fdoN7 on line 18 Warning: {closure}(): Argument #2 ($key) must be passed by reference, value given in /in/fdoN7 on line 18 Warning: {closure}(): Argument #2 ($key) must be passed by reference, value given in /in/fdoN7 on line 18 Warning: {closure}(): Argument #2 ($key) must be passed by reference, value given in /in/fdoN7 on line 18 array(5) { [0]=> int(1) [1]=> int(1) [2]=> int(16) [3]=> int(81) [4]=> int(625) }
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28
array(5) { [0]=> int(1) [1]=> int(1) [2]=> int(4) [3]=> int(9) [4]=> int(25) } array(5) { [0]=> int(1) [1]=> int(1) [2]=> int(4) [3]=> int(9) [4]=> int(25) } Warning: {closure}(): Argument #2 ($key) must be passed by reference, value given in /in/fdoN7 on line 20 Warning: {closure}(): Argument #2 ($key) must be passed by reference, value given in /in/fdoN7 on line 20 Warning: {closure}(): Argument #2 ($key) must be passed by reference, value given in /in/fdoN7 on line 20 Warning: {closure}(): Argument #2 ($key) must be passed by reference, value given in /in/fdoN7 on line 20 Warning: {closure}(): Argument #2 ($key) must be passed by reference, value given in /in/fdoN7 on line 20 array(5) { [0]=> int(1) [1]=> int(1) [2]=> int(16) [3]=> int(81) [4]=> int(625) }
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
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) } array(5) { [0]=> int(1) [1]=> int(1) [2]=> int(16) [3]=> int(81) [4]=> int(625) }
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/fdoN7 on line 18
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION in /in/fdoN7 on line 18
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected '&', expecting T_VARIABLE or '$' in /in/fdoN7 on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
Parse error: parse error, unexpected '&', expecting T_VARIABLE or '$' in /in/fdoN7 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/fdoN7 on line 5
Process exited with code 255.
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