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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
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