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If I use mod_rewrite to control all my 301 redirects, does this happen before my page is served? so if I also have a bunch of redirect rules in a php script that runs on my page, will the .htaccess kick in first?
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You can use the . htaccess file to modify various configurations and thus make changes to your website. These changes include authorization, error handling, redirects for specific URLs, user permissions, etc.
htaccess file in your terminal, you need to navigate to your web root directory. Your web root directory is where to place the . htaccess file so that your configurations can be properly executed for your website.
. htaccess files (or "distributed configuration files") provide a way to make configuration changes on a per-directory basis. A file, containing one or more configuration directives, is placed in a particular document directory, and the directives apply to that directory, and all subdirectories thereof.
If you want to run it, open any web browser and enter “localhost/demo. php” and press enter. Your program will run.
The .htaccess will kick in first. If you look at the Apache request cycle:
PHP is a response handler. mod_rewrite runs at URI translation, except for rewrite rules in .htaccess and <Directory> or <Location> blocks which run in the fixup phase. This is because Apache doesn't know which directory it's in (and thus which <Directory> or .htaccess to read) until after URI translation.
In response to to gabriel1836's question about the image, I grabbed it from the second slide of this presentation but it's originally from the book: Writing Apache Modules in Perl and C which I highly recommend.
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When a request is made to the URI affected by the .htaccess file, then Apache will handle any rewrite rules before any of your PHP code executes.
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