PHP Recursively unset array keys if match

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If you want to operate recursively, you need to pass the array as a reference, otherwise you do a lot of unnecessarily copying:

function recursive_unset(&$array, $unwanted_key) {
    unset($array[$unwanted_key]);
    foreach ($array as &$value) {
        if (is_array($value)) {
            recursive_unset($value, $unwanted_key);
        }
    }
}

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