PHP multidimensional array search by value

Question

I have an array where I want to search the uid and get the key of the array.

Examples

Assume we have the following 2-dimensional array:

<

Answer 1

$search1 = 'demo';
$search2 = 'bob';
$arr = array('0' => 'hello','1' => 'test','2' => 'john','3' => array('0' => 'martin', '1' => 'bob'),'4' => 'demo');
foreach ($arr as $value) { 
    if (is_array($value)) { 
        if (in_array($search2, $value)) { 
            echo "successsfully";    
            //execute your code 
        }
    } else {  
        if ($value == $search1) { 
            echo "success";
        }
    }
 }