title: use php to change a html elements inner text
body: <p>I have a basic form, which i need to put some validation into, I have a span area and I want on pressing of the submit button, for a predefined message to show in that box if a field is empty.</p>
  
  <p>Something like</p>
  
  <pre><code>if ($mytextfield = null) {
      //My custom error text to appear in the spcificed #logggingerror field
  }
  </code></pre>
  
  <p>I know i can do this with jquery (document.getElementbyId('#errorlogging').innerHTML = "Text Here"), but how can I do this with PHP?</p>
  
  <p>Bit of a new thing for me with php, any help greatly appreciated :)</p>
  
  <p>Thanks</p>