PHP Defining namespace



Introduction

Declaration of class, function and constants inside a namespace affects its acess, although any other PHP code can be present in it. PHP's namespace keyword is used to declare a new namespace. A file with .php extension must have namespace declaration in very first line after <?php tag, before any other code such as HTML script.

Example

<?php
namespace myspace;
class myclass{
   //
}
function hello() {
   echo "Hello World
"; } ?>

If namespace declaration is not at the top of file, PHP parser throws fatal error

Example

 Live Demo

<html>
<body>
Hello world
<?php
namespace myspace;
function hello() {
   echo "Hello World
"; } use myspace; myspace\hello(); ?> </body> </html> ?>

Output

Above code now returns name following error

PHP Fatal error: Namespace declaration statement has to be the very first statement or after any declare call in the script

Only declare construct can appear before namespace declaration

Example

<?php
declare (strict_types=1);
namespace myspace;
function hello() {
   echo "Hello World
"; } use myspace; myspace\hello(); ?>

Advertisements