title: duplicate one element from php array
body: <p>how i can duplicate one element from array:</p>
  
  <p>for example, i have this array:</p>
  
  <pre><code>Array
  (
      [LRDEPN] =&gt; 0008.jpg
      [OABCFT] =&gt; 0030.jpg
      [SIFCFJ] =&gt; 0011.jpg
      [KEMOMD] =&gt; 0022.jpg
      [DHORLN] =&gt; 0026.jpg
      [AHFUFB] =&gt; 0029.jpg
  )
  </code></pre>
  
  <p>if i want to duplicate this: 0011.jpg , how to proceed?</p>
  
  <p>i want to get this:</p>
  
  <pre><code>Array
  (
      [LRDEPN] =&gt; 0008.jpg
      [OABCFT] =&gt; 0030.jpg
      [SIFCFJ] =&gt; 0011.jpg
      [NEWKEY] =&gt; 0011.jpg
      [KEMOMD] =&gt; 0022.jpg
      [DHORLN] =&gt; 0026.jpg
      [AHFUFB] =&gt; 0029.jpg
  )
  </code></pre>