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PHP Using namespaces
Introduction
Class, function or constant in a namespace can be used in following ways:
- Using a class in current namespace
- specifying a namespace relative to current namespace
- giving a fully qualified name of namespace
From current namespace
In this example a namespace is loaded from test1.php. Function or class name referred to without namespace accesses those in current namespace
Example
#test1.php
<?php
namespace myspace\space1;
const MAX = 100;
function hello() {echo "hello in space1
";}
class myclass{
static function hellomethod() {echo "hello in space1
";}
}
?>Use this file in following code
Example
<?php
namespace myspace;
include 'test1.php';
const MAX = 200;
function hello() {echo "hello in myspace
";}
class myclass{
static function hellomethod() {echo "hello in myspace
";}
}
hello();
myclass::hellomethod();
echo MAX;
?>Output
hello in myspace hello in myspace 200
Using relative namespace
In following example function and class is accesed with relative namespace
Example
<?php
namespace myspace;
include 'test1.php';
const MAX = 200;
function hello() {echo "hello in myspace
";}
class myclass{
static function hellomethod() {echo "hello in myspace
";}
}
space1\hello();
space1\myclass::hellomethod();
echo space1\MAX;
?>Output
Above code shows following output
hello in space1 hello in space1 100
Fully qualified namespace
Functions and classes are given absolute namespace name
Example
<?php
namespace myspace;
include 'test1.php';
const MAX = 200;
function hello() {echo "hello in myspace
";}
class myclass{
static function hellomethod() {echo "hello in myspace
";}
}
\myspace\hello();
\myspace\space1\hello();
\myspace\myclass::hellomethod();
\myspace\space1\myclass::hellomethod();
echo \myspace\MAX . "
";
echo \myspace\space1\MAX;
?>Output
Above code shows following output
hello in myspace hello in space1 hello in myspace hello in space1 200 100
Updated on: 18-Sep-2020
379 Views
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