Check if specific array key exists in multidimensional array - PHP

Check if specific array key exists in multidimensional array - PHP

<?php
$array = array( 
    '21' => array(),
    '24' => array( 
        '22' => array(),
        '25' => array( 
            '26' => array() 
        ) 
    ) 
);

var_dump(multiKeyExists($array, 22));
var_dump(multiKeyExists($array, 23));

function multiKeyExists( Array $array, $key ) {
    if (array_key_exists($key, $array)) {
        return true;
    }
    foreach ($array as $k=>$v) {
        if (!is_array($v)) {
            continue;
        }
        if (array_key_exists($key, $v)) {
            return true;
        }
    }
    return false;
}


Output:
  
bool(true)
bool(false)