title: Compare arrays and add missing key value to array
body: <p>I have two arrays:</p>
  
  <p>First</p>
  
  <pre><code>array (size=6)
  0 =&gt; 
  array (size=2)
    'Age' =&gt; string '25-34' (length=5)
    'Count' =&gt; string '45' (length=2)
  1 =&gt; 
  array (size=2)
    'Age' =&gt; string '55-64' (length=5)
    'Count' =&gt; string '1' (length=1)
   2 =&gt; 
  array (size=2)
    'Age' =&gt; string '13-17' (length=5)
    'Count' =&gt; string '3' (length=1)
  3 =&gt; 
  array (size=2)
    'Age' =&gt; string '35-44' (length=5)
    'Count' =&gt; string '11' (length=2)
  4 =&gt; 
  array (size=2)
    'Age' =&gt; string '18-24' (length=5)
    'Count' =&gt; string '46' (length=2)
  5 =&gt; 
  array (size=2)
    'Age' =&gt; string '45-54' (length=5)
    'Count' =&gt; string '2' (length=1)
  </code></pre>
  
  <p>Second:</p>
  
  <pre><code>array (size=5)
  0 =&gt; 
  array (size=2)
    'Age' =&gt; string '65+' (length=3)
    'Count' =&gt; string '1' (length=1)
  1 =&gt; 
  array (size=2)
    'Age' =&gt; string '13-17' (length=5)
    'Count' =&gt; string '4' (length=1)
  2 =&gt; 
  array (size=2)
    'Age' =&gt; string '35-44' (length=5)
    'Count' =&gt; string '3' (length=1)
  3 =&gt; 
  array (size=2)
    'Age' =&gt; string '25-34' (length=5)
    'Count' =&gt; string '11' (length=2)
  4 =&gt; 
  array (size=2)
    'Age' =&gt; string '18-24' (length=5)
    'Count' =&gt; string '20 |' (length=4)
  </code></pre>
  
  <p>Now what here I am getting is that First array size is larger than Second one, so I need a solution for making the small size array similar to larger size array.</p>
  
  <p>With same keys, and add value zero to new added keys value.</p>