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Variables in PHP

From OdleWiki

Basics

Variables in PHP:

  1. always begin with a dollar sign ($)
  2. starts with a letter or underscore (_)
  3. may contain any number of letters, numbers, and underscores
  4. are case-sensitive

Acceptable Variable Names

$var $_var $_Var $VAR $VAR_001

This is not a comprehensive list, merely examples.

Unacceptable Variable Names

$var* (Variable names may only contain letters, numbers, and underscores.) $var #1 (Variable names may not contain # or spaces.) var$ (Variables names must begin with a dollar sign.)


Types of Variables

Assigning Values to Variables

To assign a value to a variable, use a single equal sign (=)

$var = "Hello, world."