title: Count the number of times a specific input is present in an form
body: <p>Is there a way to count how many times an <code>&lt;input type="text" name="a"&gt;</code> appears in an form?</p>
  
  <p>I have tried </p>
  
  <pre><code>$count = count($_POST['a']) ;
  </code></pre>
  
  <p>but this counts all inputs regardless the name of the input...</p>