Every class and function in a namespace can be referred to by the full name -
e.g. MyProject::DB::Connection or
MyProject::DB::connect - at any time.
Example #1 Using namespaced name
<?php require 'MyProject/Db/Connection.php'; $x = new MyProject::DB::Connection; MyProject::DB::connect(); ?>
Namespaces can be imported into current context (global or namespace) using
the use operator. The syntax for the operator is:
<?php /* ... */ use Some::Name as Othername;
// The simplified form of use: use Foo::Bar; // which is the same as : use Foo::Bar as Bar; ?>
The imported name works as follows: every time that the compiler encounters
the local name Othername (as stand-alone name or as
prefix to the longer name separated by ::) the imported
name Some::Name is substituted instead.
use can be used only in global scope, not inside
function or class. Imported names have effect from the point of import to
the end of the current file. It is recommended to put imports at the
beginning of the file to avoid confusion.
Example #2 Importing and accessing namespace
<?php require 'MyProject/Db/Connection.php'; use MyProject::DB; use MyProject::DB::Connection as DbConnection;
$x = new MyProject::DB::Connection(); $y = new DB::connection(); $z = new DbConnection(); DB::connect(); ?>
Note:
The import operation is compile-time only, all local names are converted to
their full equivalents by the compiler. Note that it won't translate names
in strings, so callbacks can't rely on import rules.
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