Absolute-to-Relative URLs

If you were to use this on a website like http;//example.com/test/testing/, you would get results like these:

1. • Before: http;//example.com/test/another-test/#anchor
2. • After: ../another-test/#anchor
3. • Before: http;//example.com/wp-content/themes/twentyten/style.css
4. • After: /wp-content/themes/twentyten/style.css
5. • Before: https;//example.com/wp-content/themes/twentyten/style.css
6. • After: https;//example.com/wp-content/themes/twentyten/style.css
7. • Before: http;//google.com/test/
8. • After: //google.com/test/
9. • Before: ../../../../../../../../#anchor
10. • After: /#anchor
11. • After ($output_type=1): ../../#anchor

All string parsing. No directory browsing. If you're looking for a plugin that will automatically convert all URLs on your WordPress site, instead check out my other plugin, WP-HTML-Compression. Before you copy this code and add it into your own, keep in mind that there will probably be future updates. Keeping the code within an installed plugin will make sure that you're notified.

0.3.4

• Empty, hash-only anchors ("#") are no longer invalidated to "/"

0.3.3

• JavaScript URIs ("javascript:") are no longer invalidated as paths

0.3.2

• Data URIs ("data:") are no longer invalidated as paths

0.3.1

• Domains with and without "www." are no longer considered to be identical by default, but can still be overridden

0.3

• Scheme-relative URLs (//domain.com) now supported on input and output
• Cleans up the ports and paths of external URLs
• Optionally, output only host-relative URLs (/root-dir/)
• Speed optimizations
• Minor bug fixes

0.2

• Path-relatve URLs (../), or parenting, now supported on input and output
• Differentiates schemes/protocols, usernames, passwords, hosts, ports, paths, resources/files, queries and fragments/hashes
• Considers domains with and without "www." to be identical, and can be overridden
• Outputs the shortest url (host- or path-relative) by default, and can be overridden
• Custom site URL support, but only with a separate new Absolute_to_Relative_URLs() instance

0.1

• Initial release