[code] PHP

1. Creating PHP Helper Functions
2. Introducing PHP Classes
3. PHP Sessions
4. Object Oriented PHP (for Beginners)
5. Passing by reference
6. PHP References

   How They Work, and When to Use Them
7. 4 more

1. PHP Cheat Sheet (DaveChild)
2. Upgrading PHP 5.X To PHP 7
3. BlueShoes: PHP Cheat Sheet
4. PHP Cheat Sheet | OverAPI.com

1. Online PHP Shell

Proprietary & Advanced Methods

1. Anonymous Functions
2. Mimicking Anonymous Classes using Closures
3. PHP Anonymous Functions

   What Are They, and Why Use Them?
4. Lambdas & Closures

1. PHP: crypt - Manual
2. PHP: fopen - Manual

Programs & Apps to Make!

1. How to make a simple HTML template engine in PHP
2. How to make a simple web crawler
3. Parsing robots.txt < PHP | The Art of Web
4. Template Engines
5. Views and Templates | Fat-Free Framework for PHP

1. Debugging & Profiling - Xdebug
2. Alan Storm: A Survey of PHP Error Handling
3. A primer on PHP exceptions · daschl writes. sometimes.
4. Custom Error Handling in PHP
5. Exception handling – Hacking with PHP - Practical PHP
6. Error Handling
7. 3 more

XSS, SQL Injection, etc...

1. Create MySQL Injection free Secure Login System in PHP - Subin's Blog
2. How to program a basic but secure login system using PHP and MySQL
3. » How to protect your emails with PHP and Javascript
4. Making A Cool Login System With PHP, MySQL & jQuery | Tutorialzine
5. Obfuscate your e-mail address with PHP, JavaScript and CSS - CodeForest
6. PHP Login script tutorial
7. 2 more

1. Benefits Of Xml
2. How to parse XML with PHP5 - Treehouse Blog
3. Parsing XML at the Speed of Light
4. PHP and XML
5. PHP Master | Parsing XML With SimpleXML
6. PHP: XML Parser - Manual
7. 1 more

1. Database helper class to generate CRUD statements using PHP and MySQL | Angular Code
2. PHP CRUD Tutorial for Beginners (PDO, MySQLi, and MySQL)
3. PHP & MySQL For Dummies Cheat Sheet - For Dummies
4. PHP: mysqli::prepare - Manual
5. PHP MySQL Login Script | PHPSense.com
6. PHP Prepared Statements
7. 2 more

1. Handling JSON like a boss in PHP · daschl writes. sometimes.
2. JSON/XML Speed Test Experiment