title: Use PHP in_array with mutli array
body: <p>I want to use the same principe that in_array, but with a double array and only search in the first value. Let me explain : </p>
  
  <pre><code>$array_1 = [["1","aaa"],["2","bbb"],["3","aaa"],["4","ddd"]]
  
  $array_2 = [["2","bbb"],["3","aaa"],["4","ddd"]]
  </code></pre>
  
  <p>Now i want the function return ["1", "aaa"] because this part is not in the second array. But I want to search difference only with the id (number 1, 2, 3 and 4), not with the text who can be similar, but never the id.</p>