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Learn PHP

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Introduction to PHP
Introducing a PHP course with a difference (this one assumes that you already know a scripting language such as JavaScript and concentrates on the ways in which PHP differs from other languages).
PHP Variables
The way you define and reference variables in PHP has a few differences from other languages.
PHP Operators
As with variables, PHP operators don;t work quite the same way as some other languages.
PHP Decisions
PHP supports additiional ways of coding if and switch statements that you may not have come across in other languages.
PHP Loops
There are also more alternatives for creating loops.
PHP Objects
PHP is an object oriented language and so supports both classes and objects.
PHP Scope of Variables
Your PHP variables are local in scope unless you specifically make them global.
PHP and Cookies
There are a few extra options with processing cookies from PHP that are not available to JavaScript.
Regular Expressions in PHP
The differences between how JavaScript and PHP define and use regular expressions are relatively minor.