3v4l.org

run code in 150+ php & hhvm versions
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<?php $iterator = 10; $cat = array(1 => 'a',2 => 'b',3 => 'c'); foreach ($cat as $k => &$c)//observe the '&' { if ($iterator < 15) { $cat[$iterator] = $iterator; $iterator++; } echo $c; } var_dump($cat);
Output for 5.2.2 - 7.1.0
abc1011121314array(8) { [1]=> string(1) "a" [2]=> string(1) "b" [3]=> string(1) "c" [10]=> int(10) [11]=> int(11) [12]=> int(12) [13]=> int(13) [14]=> &int(14) }
Output for 5.0.0 - 5.2.1
abcarray(6) { [1]=> string(1) "a" [2]=> string(1) "b" [3]=> string(1) "c" [10]=> int(10) [11]=> int(11) [12]=> int(12) }
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected '&', expecting T_VARIABLE or '$' in /in/K0k7l on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected '&', expecting T_VARIABLE or '$' in /in/K0k7l 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/K0k7l on line 5
Process exited with code 255.