commands/help/topics/php.txt
See these links/courses for learning PHP:
PHP Official Documentation (select a language on the page)
<http://php.net/docs.php>
Learn PHP the right way (online free book)
<http://www.phptherightway.com>
PHP 5 Tutorials
<https://w3schools.com/php/>
A simple tutorial (good introduction)
<https://php.net/manual/en/tutorial.php>
Free Course: Fundamental Programming Concepts
<https://codecademy.com/learn/php>
Codeschool's PHP courses
<https://www.codeschool.com/search?utf8=%E2%9C%93&query=php>
Beginner PHP at Treehouse
<https://teamtreehouse.com/tracks/beginner-php>
Intermediate PHP at Treehouse
<https://teamtreehouse.com/tracks/intermediate-php>
PHP 5: Interactive tutorial
<http://www.tutorialspoint.com/php/>
See these resources for learning what's new in PHP 7:
PHP 7: Up and running
<https://laracasts.com/series/php7-up-and-running/episodes/1>
PHP 7: Interactive tutorial
<http://www.tutorialspoint.com/php7/>