Скачать или смотреть How to work with Variables in PHP

This tutorial will teach you how to work with variables in PHP and you will be able to distinguish variables on the basis of their scope

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In this tutorial you will learn how to work with variables in PHP and also be able to distinguish php variables on the basis of their scope.

Step 1: Kinds of Variables in PHP

Variables are letters or words used to hold on to values. These values can be digits, letters, words, or sentences. Unlike other languages, variables in PHP are armed with a very versatile ability; they are loosely typed. They are not bound to a single data type, nor are declared along with one. Though this sounds complicating, this nature of variables allows powerful usability. A single variable in PHP can be used to save a number or a string at different points in time.

Step 2: How to Declare Variables in PHP
Php variables are named with a dollar sign as prefix to variable name. This indicated that this is a variable. Each variable in PHP is declared the moment a value is assigned to it.

Step 3: Stating variable and string in PHP

Any variable in PHP can be assigned a number or an expression. A variable can be assigned a string value also. String values are required to be single quoted in order for PHP to determine them as strings.

Step 4: Space of variables in PHP
Any variable in PHP has either a local scope or a global scope. A vriable with a global scope exists outside of all PHP functions, while a variable local scope exists inside a particular function.

Step 5: Variables with global scope in PHP

Local variables are only accessible inside the function they have been declared but global variables can be used anywhere inside the PHP document, however they cannot be used directly inside of functions and must be used with the global keyword or through the global array. PHP automatically stores all global variables inside the global array.