Mysql:

http://code.tutsplus.com/tutorials/top-20-mysql-best-practices–net-7855

http://www.sitepoint.com/mysql-mistakes-php-developers/

http://www.ajaxline.com/32-tips-to-speed-up-your-mysql-queries

Mysql perfoemance blog:

http://www.mysqlperformanceblog.com/

Php:

https://phpbestpractices.org/

 

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