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301 Redirects using Apache mod_rewrite or RedirectMatch in .htaccess or httpd.conf

Replace underscores in URLs with hyphens using Apache .htaccess.

CURL Guide for sending POST data form request with PHP and CURL

Time-dependant rewriting uses mod_rewrite and apache server time variables to display different files depending on the time, while the URL stays the same. An often requested implementation of this is to display a different home page or image depending on if its morning, noon, or night.

Securing Subdirectories using unique apache htaccess solutions.

• When php run as Apache Module (mod_php)
• When php run as CGI
• When cgi?d php is run with wrapper (for FastCGI)

Fighting Blog Spam with Apache htaccess and other methods.