array search multidimensional php

1$key = array_search('100', array_column($userdb, 'uid'));
2

1function find_customer_mobile($customers, $mobile) {
2    foreach($customers as $index => $cust) {
3        if($cust['mobile'] == $mobile) return $index;
4    }
5    return FALSE;
6}

1  /**
2   * PHP Search an Array for multiple key / value pairs
3   */
4
5  function multi_array_search($array, $search) {
6    // Create the result array
7    $result = array();
8
9    // Iterate over each array element
10    foreach ($array as $key => $value){
11
12      // Iterate over each search condition
13      foreach ($search as $k => $v){
14
15        // If the array element does not meet the search condition then continue to the next element
16        if (!isset($value[$k]) || $value[$k] != $v){
17          continue 2;
18        }
19      }
20      // Add the array element's key to the result array
21      $result[] = $key;
22    }
23
24    // Return the result array
25    return $result;
26  }
27
28  // Output the result
29  print_r(multi_array_search($list_of_phones, array()));
30
31  // Array ( [0] => 0 [1] => 1 )
32
33  // Output the result
34  print_r(multi_array_search($list_of_phones, array('Manufacturer' => 'Apple')));
35
36  // Array ( [0] => 0 )
37
38  // Output the result
39  print_r(multi_array_search($list_of_phones, array('Manufacturer' => 'Apple', 'Model' => 'iPhone 6')));
40
41  // Array ( )
42