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run code in 150+ php & hhvm versions
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<?php set_time_limit(1); $arr = ['a', 'b']; $child = &$arr; $i = 1; foreach ($child AS $key => $fruit) { $child[$i] = $fruit; unset($child[$key]); $i++; } var_dump($arr);
based on o5X83
Output for 7.0.0 - 7.1.0
array(1) { [2]=> string(1) "b" }
Output for 5.4.0 - 5.6.21
array(1) { [2]=> string(1) "a" }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/O9Y1P on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/O9Y1P on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/O9Y1P on line 5
Process exited with code 255.