Checking for "iframe" (case insensitive) on website.

This code was written by WebSanity - web design and Internet Marketing.
If you have any problems with the script do let us know (although, unfortunately, we can't promise to fix them for you!
If you use this code we'd appreciate a link to our website from your blog or somewhere, or a review on Google local (WebSanity, Huntingdon) - Thanks!

Ignoring jpg pdf zip psd doc gif swf xls file extensions.
Ignoring files over 1048576 bytes in size.
Ignoring files before 1 August 2009.
Possible flags are:
None - display all files [detect-signature.php]
detect_errors_only - Stop searching as soon as an error is found [detect-signature.php?detect_errors_only]
display_errors_only - Only list files in which signature is found [detect-signature.php?display_errors_only]
Detecting first error only
Virus signature found on website