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PHP Variables

Variables are used for storing values, such as numbers, strings or function results, so that they can be used many times in a script.

Variables in PHP

Variables are used for storing a values, like text strings, numbers or arrays.

When a variable is set it can be used over and over again in your script

All variables in PHP start with a $ sign symbol.

The correct way of setting a variable in PHP:

$var_name = value;

New PHP programmers often forget the $ sign at the beginning of the variable. In that case it will not work.

Let's try creating a variable with a string, and a variable with a number:

<?php
$txt = "Hello World!";
$number = 16;
?>

PHP is a Loosely Typed Language

In PHP a variable does not need to be declared before being set.

In the example above, you see that you do not have to tell PHP which data type the variable is.

PHP automatically converts the variable to the correct data type, depending on how they are set.

In a strongly typed programming language, you have to declare (define) the type and name of the variable before using it.

In PHP the variable is declared automatically when you use it.

Variable Naming Rules

• A variable name must start with a letter or an underscore "_"
• A variable name can only contain alpha-numeric characters and underscores (a-Z, 0-9, and _ )
• A variable name should not contain spaces. If a variable name is more than one word, it should be separated with underscore ($my_string), or with capitalization ($myString)

• Introduction to PHP
• PHP Installation
• PHP Syntax
• PHP String
• PHP Operators
• PHP If...Else Statements
• PHP Switch Statement
• PHP Arrays
• PHP Looping
• PHP Functions
• PHP Forms and User Input
• PHP $_GET
• PHP $_POST
• PHP Date
• PHP Include File
• PHP File Handling
• PHP File Upload
• PHP Cookies
• PHP Sessions
• PHP Sending E-mails
• PHP Secure E-mails
• PHP Error Handling
• PHP Exception Handling
• PHP Filter
• PHP MySQL Introduction
• PHP MySQL Connect to a Database
• PHP MySQL Create Database and Tables
• PHP MySQL Insert Into
• PHP MySQL Select
• PHP MySQL The Where Clause
• PHP MySQL Order By Keyword
• PHP MySQL Update
• PHP MySQL Delete From
• PHP Database ODBC

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