Here are some links to other sites you may find useful:
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PHP.net - home of the PHP open source programming language
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PHP The Right Way - a great guide to good practice when programmign in PHP by Josh Lockhart
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PHP-FIG - where the PSRs can be found (Programming Standsards Recommendations)
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Symfonycasts - lots of video training (some free) about PHP, Twig (as well as the Symfony open-source PHP web aoppliaiotn framework)
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Composer - the open-source PHP project dependency Manager
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Packagist - the free repository for PHP packages (which Composer can install into your projects)
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Twig - perhaps the most popular open-source PHP templating library
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Doctrine-project - perhaps the most popular open-source PHP ORM (Object-Relational Mapping) library
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my open-source, simple PHP ORM library, verbosely named "pdo-crud-for-free-repositories" (it does what it says on the tin ...)
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the guide I made for my university PHP programming students using Windows computers
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here is lionger list of PHP resources you might also find useful (by Jamie York a.k.a. ziadoz)