Core framework code style

1. Overview

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• Files MUST use only <?php tags.
• Files MUST use only UTF-8 without BOM for PHP code.
• Code MUST use tabs for indenting, not spaces.
• Class names MUST be declared in StudlyCaps.
• Class constants MUST be declared in all upper case with underscore separators.
• Method names MUST be declared in camelCase.
• Property names MUST be declared in camelCase
• Property names MUST start with an initial underscore if they are private.
• Indentation uses http://en.wikipedia.org/wiki/Indent_style#Allman_style with single line expressions on next line, without braces.

2. Files

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2.1. PHP Tags

PHP code MUST use the long <?php ?> tags; it MUST NOT use the other tag variations.

2.2. Character Encoding

PHP code MUST use only UTF-8 without BOM.

3. Class Names

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Class names MUST be declared in StudlyCaps. Core classes should be prefixed with C. For example, CController, CWidget. Application and extension classes should not use C as prefix. For extensions it's common to use E.

4. Class Constants, Properties, and Methods

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The term "class" refers to all classes and interfaces here.

4.1. Constants

Class constants MUST be declared in all upper case with underscore separators. For example:

<?php
class Foo
{
    const VERSION = '1.0';
    const DATE_APPROVED = '2012-06-01';
}

4.2. Properties

Property names MUST be declared in camelCase. Property names MUST start with an initial underscore if they are private. Private properties MUST start with underscore (private $_someProp).

For example:

<?php
class Foo
{
    public $publicProp;
    protected $protectedProp;
    private $_privateProp;
}

4.3. Methods

Method names MUST be declared in camelCase().

4.4 Doc blocks

@param and @var must declare types as boolean, integer, string, array, null.