title: using array_search for multi dimensional array
body: <p>using array_search in a 1 dimensional array is simple</p>
  
  <pre><code>$array = array("apple", "banana", "cherry");
  $searchValue = "cherry";
  $key = array_search($searchValue, $array);
  
  echo $key;
  </code></pre>
  
  <p>but how about an multi dimensional array?</p>
  
  <pre><code>    #RaceRecord
  
      [CarID] [ColorID] [Position]
  [0]    1        1         3
  [1]    2        1         1
  [2]    3        2         4
  [3]    4        2         2
  [4]    5        3         5
  </code></pre>
  
  <p>for example i want to get the index of the car whose position is 1. How do i do this?</p>