PHP is a standard language to learn for a web developer. I started using WordPress as a blogging platform to get familiar with how PHP works. Now I have modified the code a little and can recognize some functions. I am going to start to work through the tutorials on W3School.org for PHP to get more familiar with it. If you know of other high quality tutorials post a comment and let me know. I’ not really interested in books at this time because I am living in France and it would be hard for me to find the books in English and books in France are VERY expensive.
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The best PHP documentation I can recommend is the offical PHP documentation at: http://www.php.net/docs.php