• PHP Video Tutorials

PHP - Global Variables


Advertisements

Scope can be defined as the range of availability a variable has to the program in which it is declared. PHP variables can be one of four scope types −

  • Local variables
  • Function parameters
  • Global variables
  • Static variables.

Global Variables

In contrast to local variables, a global variable can be accessed in any part of the program. However, in order to be modified, a global variable must be explicitly declared to be global in the function in which it is to be modified. This is accomplished, conveniently enough, by placing the keyword GLOBAL in front of the variable that should be recognized as global. Placing this keyword in front of an already existing variable tells PHP to use the variable having that name. Consider an example −

<?php
   $somevar = 15;
   
   function addit() {
      GLOBAL $somevar;
      $somevar++;
      
      print "Somevar is $somevar";
   }
   
   addit();
?>

This will produce the following result −

Somevar is 16
php_variable_types.htm

Useful Video Courses


Video

PHP Online Training

45 Lectures 9 hours

Malhar Lathkar

Video

Become PHP Facebook Developer: Password-Less Authentication

34 Lectures 4 hours

Syed Raza

Video

Ultimate PHP & MySQL Web Development Course & OOP Coding

84 Lectures 5.5 hours

Frahaan Hussain

Video

Learn PHP from Scratch

17 Lectures 1 hours

Nivedita Jain

Video

E Commerce Website Development In PHP With PDO

100 Lectures 34 hours

Azaz Patel

Video

PHP in Telugu

43 Lectures 5.5 hours

Vijay Kumar Parvatha Reddy

Advertisements