title: Remove all replicated values in array, only keeping the unique key/value pair
body: <p>How can I remove all the replicated values in an array, only keeping the remaining unique key/value? <code>array_unique</code> isn't the solution.</p>
  
  <p>For example, I have the following array.</p>
  
  <pre><code>Array
  (
      [169580] =&gt; 1901
      [209662] =&gt; 2245
      [209682] =&gt; 1901
  )
  </code></pre>
  
  <p>I want to compare all values in array and remove both <code>[169580] =&gt; 1901</code> and <code>[209682] =&gt; 1901</code> and keep <code>[209662] =&gt; 2245</code> in the array.  The 'key' is an unknown value that I cannot search for.</p>
  
  <p>Final result will look like the following:</p>
  
  <pre><code>Array
  (
      [209662] =&gt; 2245
  )
  </code></pre>