title: How to merge inner array with same key value
body: <p>Please help to solve this issue
  i want to change this </p>
  
  <pre><code>[UI Testing] =&gt; Array
          (
              [0] =&gt; Array
                  (
                      [0] =&gt; 0
                      [1] =&gt; 70
                  )
  
              [1] =&gt; Array
                  (
                      [0] =&gt; 40
                      [1] =&gt; 0
                  )
  
          )
  </code></pre>
  
  <p>TO</p>
  
  <pre><code>[UI Testing] =&gt; Array
          (
              [0] =&gt; Array
                  (
                      [0] =&gt; 40
                      [1] =&gt; 70
                  )
  
          )
  </code></pre>
  
  <p>Thanks.</p>