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run code in 200+ php & hhvm versions
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<?php $choices = array( 10 => array('10', '100'), 20 => array('20', '400'), ); var_dump($choices); foreach ($choices as $choice) { $choice[0] += 1; } var_dump($choices); foreach ($choices as &$choice) { $choice[0] += 1; } var_dump($choices);
Output for 5.2.1 - 7.2.0
array(2) { [10]=> array(2) { [0]=> string(2) "10" [1]=> string(3) "100" } [20]=> array(2) { [0]=> string(2) "20" [1]=> string(3) "400" } } array(2) { [10]=> array(2) { [0]=> string(2) "10" [1]=> string(3) "100" } [20]=> array(2) { [0]=> string(2) "20" [1]=> string(3) "400" } } array(2) { [10]=> array(2) { [0]=> int(11) [1]=> string(3) "100" } [20]=> &array(2) { [0]=> int(21) [1]=> string(3) "400" } }
Output for 5.0.0 - 5.2.0
array(2) { [10]=> array(2) { [0]=> string(2) "10" [1]=> string(3) "100" } [20]=> array(2) { [0]=> string(2) "20" [1]=> string(3) "400" } } array(2) { [10]=> array(2) { [0]=> string(2) "10" [1]=> string(3) "100" } [20]=> array(2) { [0]=> string(2) "20" [1]=> string(3) "400" } } array(2) { [10]=> &array(2) { [0]=> int(11) [1]=> string(3) "100" } [20]=> &array(2) { [0]=> int(21) [1]=> string(3) "400" } }
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected '&', expecting T_VARIABLE or '$' in /in/jtV4f on line 16
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected '&', expecting T_VARIABLE or '$' in /in/jtV4f on line 16
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_VARIABLE' or `'$'' in /in/jtV4f on line 16
Process exited with code 255.