If all you have for an image is the URL, you can still find the dimensions:

<?php
  list($width, $height, $type, $attr)=getimagesize("url/to/image.jpg";  echo "Image width ". $width;  echo "Image height ". $height;  echo "Image type ". $type;  echo "Attribute ". $attr;?>

Seems the code is a raw product, whats the next thing to do to make it a final product?

You already got your answer, wetin you come dey find again now?

dhtml18:
You already got your answer, wetin you come dey find again now?

Where can i put the codes for it to display the dimension of a picx, or i should upload it as a script in a page

The dollar sign is the variable. You get it? The dollar sign is the variable. You seem to be a newbie in php.... Anyway, ask whosoever wrote the code to elaborate. I'm not into php.