Php namespace namespace
The official statement is:
In PHP, namespaces are used to solve two types of problems encountered when writing a class library or application to create reusable code such as a class or function
1. User-written code conflicts with the name of a class/function/constant or third-party class/function/constant within PHP.
2. Create an alias (or short) name for a very long identifier name (usually defined to alleviate the first type of problem) and improve the readability of the source code.
In fact, the namespace is to solve the introduction of different files exist two the same class, where __namespace__ can get the name of NAMESPACE.
For example, I have an index file that introduces test.php and test2.php. But these two files contain class take, so we're in the index.php file.
To instantiate the new take will be an error, and then we need to use the namespace.
test.php
namespace takes;
Class Take {
function __construct () {
Print "This is Test file! Name is: ". __namespace__;
}
}
test2.php
namespace my;
Class Take {
function __construct () {
Print "This is a My files! Not Test,name is: ". __namespace__;
}
}
index.php
Use takes as A; The namespace of the take class in the test file is then aliased to a (purely practice);
Require_once (' test.php ');
Require_once (' test2.php ');
$obj = new A\take (); Take class in the test file
Print " ";
$obj 2 = new My\take (); Take class in the Test2 file
The output result is
This is Test file! Name Is:takes
————————————————————————————————————————————————
This is a My files! Not Test,name Is:my
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