Convert Array in Array having integer key in one array in PHP : <p>i am having a list of array in array which i want to convert to a single Array.</p>

<p>Here is my array:-</p>

<pre><code>Array
  (
   [0] =&gt; Array
    (
        [0] =&gt; 
    )

   [1] =&gt; Array
    (
        [0] =&gt; 13
        [1] =&gt; 9
    )

   [2] =&gt; Array
    (
        [0] =&gt; 13
        [1] =&gt; 15
    )

)
</code></pre>

<p>How can i get this to a single array. I have checked <code>array_column</code> but i don't have any key name so don't know how to use this. </p>

<p>Answer should be something like:</p>

<pre><code>Array
(
  [0] =&gt; 13
  [1] =&gt; 9
  [2] =&gt; 13
  [3] =&gt; 15
)
</code></pre>

<p>Any help will be highly appreciated.</p>
