title: Merge two indexed arrays of indexed arrays based on first column value
body: <p>I have two arrays like this:</p>
  <pre><code>$array1 = [
      [10, 'Some Name..'],
      [11, 'Some Name..'],
      [13, 'Some Name..'],
  ];
  
  $array2 = [
      [13, 'Viewed']
  ];
  </code></pre>
  <p>How can I merge these two arrays without looping? Is there any php functionality available for this? I need this kind of output:</p>
  <pre><code>[
      [10, 'Some Name..'],
      [11, 'Some Name..'],
      [13, 'Some Name..', 'Viewed']
  ]
  </code></pre>