3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $arr = array( 'Test' => 1, 'OtherKey' => 2, ); $keyTranslation = array( 'OtherKey' => 'other_key', 'Test' => 'test', ); function test(&$arr, $keyTranslation) { foreach ($arr as $key => $value) { var_dump($keyTranslation[$key]); $arr["'".$keyTranslation[$key]."'"] = $value; unset($arr[$key]); } } test($arr, $keyTranslation);
based on ZuA2u
Output for 7.0.0 - 7.2.0
string(4) "test" string(9) "other_key"
Output for 5.3.19 - 5.6.28
string(4) "test" string(9) "other_key" Notice: Undefined index: 'test' in /in/8nmfS on line 13 NULL Notice: Undefined index: 'test' in /in/8nmfS on line 14 Notice: Undefined index: 'other_key' in /in/8nmfS on line 13 NULL Notice: Undefined index: 'other_key' in /in/8nmfS on line 14 Notice: Undefined index: '' in /in/8nmfS on line 13 NULL Notice: Undefined index: '' in /in/8nmfS on line 14