title: How to count array empty values with php?
body: <p>How to calculate the numbers of arrays whose values are empty.
  For example, I have array result:</p>
  
  <pre><code>    Array (
         [0] =&gt; 'A',
         [1] =&gt; 'B',
         [2] =&gt; 'C',
         [3] =&gt; '',
         [4] =&gt; '',
         [5] =&gt; 'F',
         [6] =&gt; '')
  </code></pre>
  
  <p>Here are 3 empty array values (index 3,4,6), so how the way get the number of empty array values</p>