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language functions ,
include functions ,
variable functions ,
post functions
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The ability to refer to an external fully qualified name with an alias, or importing, is an important feature of namespaces. This is similar to the ability of unix-based filesystems to create symbolic links to a file or to a directory.
PHP namespaces support two kinds of aliasing or importing: aliasing a class name, and aliasing a namespace name. Note that importing a function or constant is not supported.
In PHP, aliasing is accomplished with the use operator. Here is an example showing all 3 kinds of importing:
Beispiel #1 importing/aliasing with the use operator
<?php
namespace foo;
use My\Full\Classname as Another;
// this is the same as use My\Full\NSname as NSname
use My\Full\NSname;
// importing a global class
use \ArrayObject;
$obj = new namespace\Another; // instantiates object of class foo\Another
$obj = new Another; // instantiates object of class My\Full\Classname
NSname\subns\func(); // calls function My\Full\NSname\subns\func
$a = new ArrayObject(array(1)); // instantiates object of class ArrayObject
// without the "use \ArrayObject" we would instantiate an object of class foo\ArrayObject
?>
PHP additionally supports a convenience shortcut to place multiple use statements on the same line
Beispiel #2 importing/aliasing with the use operator, multiple use statements combined
<?php
use My\Full\Classname as Another, My\Full\NSname;
$obj = new Another; // instantiates object of class My\Full\Classname
NSname\subns\func(); // calls function My\Full\NSname\subns\func
?>
Importing is performed at compile-time, and so does not affect dynamic class, function or constant names.
Beispiel #3 Importing and dynamic names
<?php
use My\Full\Classname as Another, My\Full\NSname;
$obj = new Another; // instantiates object of class My\Full\Classname
$a = 'Another';
$obj = new $a; // instantiates object of class Another
?>
In addition, importing only affects unqualified and qualified names. Fully qualified names are absolute, and unaffected by imports.
Beispiel #4 Importing and fully qualified names
<?php
use My\Full\Classname as Another, My\Full\NSname;
$obj = new Another; // instantiates object of class My\Full\Classname
$obj = new \Another; // instantiates object of class Another
$obj = new Another\thing; // instantiates object of class My\Full\Classname\thing
$obj = new \Another\thing; // instantiates object of class Another\thing
?>
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