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run code in 150+ php & hhvm versions
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<?php $a = array('a' => 'a', 'b' => 'b', 'z' => array('c' => 'c', 'd' => 'd')); $b = array('a' => 'c', 'z' => array('c' => 'e')); $merge = function(&$a, &$b) use (&$merge){ if (is_array($a) && is_array($b)){ foreach ($b as $key => &$value){ if (is_array($value) && isset($a[$key]) && is_array($a[$key])){ $a[$key] = $merge($a[$key], $value); } else { if (is_int($key)){ $a[] = $value; } else { $a[$key] = $value; } } } return $a; } else { return $b; } }; var_dump($merge($a, $b));
Output for 5.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(3) { ["a"]=> string(1) "c" ["b"]=> string(1) "b" ["z"]=> array(2) { ["c"]=> string(1) "e" ["d"]=> string(1) "d" } }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/0PpmZ 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 T_FUNCTION in /in/0PpmZ on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/0PpmZ on line 5
Process exited with code 255.