Getting image ratio from a string

[persa]

Iam getting data from mysql table, from the a field of type: text.. i want to search that string for , and not replace it with an image at once.. I want to do following:

1. See if the image exits

2. If it does, check the image type(jpg,gif accepted types)

3. check the image ratio(height/width), and adjust if necasarry

4. NOW, replace the [IMG], with the new information, including the new width and height
   [/list=1]

   Anyone have any ideas to how I can think on this issue?
   earlier I used:

   $text = preg_replace("/[IMG](.*)[\/IMG]/", "<img src=\"\1\" alt=\"\" border=\"0\" style=\"display:block;\">", $text);

   to replace a image, but it sucks with large images..

   Any ideas??

[Weedpacket]

Use preg_replace with the /e modifier, or preg_replace_callback, and put steps 1..4 in a function. The latter, for preference, and just return the string unchanged if the steps fail.