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run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = array('foo' => "xyz", null => "abc"); $b = array('bar' => "baz", null => "xyz"); var_dump(array_merge_recursive($a,$b)); var_dump(merge_old($a,$b)); var_dump(merge($a,$b)); function merge(array $a, array $b) { foreach ($b as $key => $value) { if (isset($a[$key])) { if (is_int($key)) { $a[] = $value; } elseif (is_array($value) && is_array($a[$key])) { $a[$key] = merge($a[$key], $value); } else { $a[$key] = $value; } } else { $a[$key] = $value; } } return $a; } function merge_old(array $a, array $b) { foreach ($b as $key => $value) { if (array_key_exists($key, $a)) { if (is_int($key)) { $a[] = $value; } elseif (is_array($value) && is_array($a[$key])) { $a[$key] = merge_old($a[$key], $value); } else { $a[$key] = $value; } } else { $a[$key] = $value; } } return $a; }
Output for 5.1.0 - 5.2.17, 5.3.1 - 7.1.0
array(3) { ["foo"]=> string(3) "xyz" [""]=> array(2) { [0]=> string(3) "abc" [1]=> string(3) "xyz" } ["bar"]=> string(3) "baz" } array(3) { ["foo"]=> string(3) "xyz" [""]=> string(3) "xyz" ["bar"]=> string(3) "baz" } array(3) { ["foo"]=> string(3) "xyz" [""]=> string(3) "xyz" ["bar"]=> string(3) "baz" }
Output for 5.3.0
array(3) { ["foo"]=> string(3) "xyz" [""]=> array(2) { [0]=> string(3) "abc" [1]=> string(3) "xyz" } ["bar"]=> string(3) "baz" } array(3) { ["foo"]=> string(3) "xyz" [""]=> array(1) { [0]=> string(3) "xyz" } ["bar"]=> string(3) "baz" } array(3) { ["foo"]=> string(3) "xyz" [""]=> array(1) { [0]=> string(3) "xyz" } ["bar"]=> string(3) "baz" }
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_ARRAY, expecting '&' or T_VARIABLE in /in/iPi6l on line 12
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_ARRAY, expecting ')' in /in/iPi6l on line 12
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_ARRAY, expecting ')' in /in/iPi6l on line 12
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/iPi6l on line 12
Process exited with code 255.