title: How to merge all key values into one in single array in php
body: <p>I have an array value like below,</p>
  
  <pre><code>Array ( [0] =&gt; ["f","a","s","d"] [1] =&gt; ["d","b","a","c"] [2] =&gt; ["c"])
  </code></pre>
  
  <p>and also i want the array value like merged as below mentioned</p>
  
  <pre><code>Array ( [0] =&gt; ["f","a","s","d","d","b","a","c","c"])
  </code></pre>
  
  <p>The all key value should be merged under one new array key</p>