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W e b t u t o r i a l s

Define PHP

PHP Installation


PHP Case Sensitivity

PHP Variable

PHP Echo & Print

PHP Operators

PHP Receiving Input

PHP Decision Making

PHP Loops

PHP Jumping Statement

PHP Image Gallery

PHP Arrays

PHP File Upload

PHP String Functions

PHP Math Functions

PHP Functions

PHP Variable Scope

PHP Constant Variable

PHP Superglobals

PHP Form Validation

PHP Include Statement

PHP Filter

PHP File Handling

PHP Date Functions

PHP Cookies

PHP Session

PHP Send Emails

PHP Captcha

PHP-MySQL Connectivity

PHP MySQL Select

PHP MySQL Insert

PHP MySQL Delete

PHP MySQL Update

PHP MySQL Injection

PHP Variable Scope

Variable Scope can be defined as the range of availability of a variable in which it is declared. In PHP, variables can be declared anywhere in the script and has three different variable scopes:
Local: A variable declared in a function is considered as local variable and can only be accessed within that function.
Global: A variable declared outside a function has a GLOBAL SCOPE and can only be accessed outside a function. In contrast to local variables, a global variable can be accessed in any part of the program. In order to access a Global variable, place the keyword GLOBAL in front of the variable
Static: Normally, when a function is completed/executed, all of its variables are deleted. However, sometimes we want a local variable NOT to be deleted. We need it for a further job. In that case we can declare a variable as static.

Example 1: LOCAL SCOPE
Example 2.1: GLOBAL SCOPE
Example 2.2: GLOBAL SCOPE
Example 2.3: GLOBAL SCOPE. PHP stores all global variables in an array called $GLOBALS[index]. The index holds the name of the variable.
Example 3: Static Keyword