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)

Simpler version of your code (faster):
One thing, you are not accounting for a 3rd or 4th ..... dimensions right ?

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;
}

In other words you will never find 222:

$array = array(
'21' => array(),
'24' => array(
'22' => array(),
'25' => array(
'26' => array(
'222' => array(),
)
)
)
);

function array_key_exists_r($needle, $haystack)
{
$result = array_key_exists($needle, $haystack);
if ($result) return $result;

    foreach ($haystack as $v) {
            if (is_array($v)) {
                    $result = array_key_exists_r($needle, $v);
            }
            if ($result) return $result;
    }
    return $result;

}
// does not go deep enough
var_dump(multiKeyExists($array, '222'));
var_dump(multiKeyExists($array, '23'));

/// this works
var_dump(array_key_exists_r('222',$array));