title: blank space gets automatically replaced by underscore
body: <p>I have the following php code in my input field:</p>
  
  <pre><code>&lt;input type="submit" name='&lt;?php echo $row["date"];?&gt;' value="send"&gt;
  </code></pre>
  
  <p>a <code>var_dump($row["date"])</code> shows the data is a string like so:</p>
  
  <pre><code>string '2015-10-03 19:01:47' (length=19)
  </code></pre>
  
  <p>Why then, when I post this form, does the blank space get automatically replaced by an underscore and how can I avoid that?</p>
  
  <p><code>var_dump($_POST)</code>:</p>
  
  <pre><code>array (size=1)
  '2015-10-03_19:01:47' =&gt; string 'send' (length=4)
  </code></pre>