title: Put form data into a PHP array
body: <p>I have this form</p>
  
  <pre><code>  &lt;form action = "put the data to a single PHP array" method="post"&gt;
      &lt;input name="a" type="text" /&gt;
      &lt;input name="b" type="text" /&gt;
      &lt;input name="c" type="text" /&gt; 
      &lt;input name="d" type="text" /&gt; 
      &lt;input type="button"&gt;
    &lt;/form&gt;
  </code></pre>
  
  <p>the condition is that I want to put the data into a PHP array when the user filled the form and click the submit button. the data should be order the way the text input fields are arranged. how can I do that? </p>
  
  <p>Pls help me with the code. thanks!</p>