php using aliases and imports
Allowing external fully qualified names to be referenced or imported through aliases is an important feature of namespaces. This is somewhat similar to how you can create symbolic links to other files or directories in a Unix-like file system.
PHP namespace supports two ways of using aliases or imports: using aliases for class names, or using aliases for namespace names. Note that PHP does not support imported functions or constants.
In PHP, aliases are implemented through the operator use. Here is an example using all three possible ways of importing:
Example #1 Use the use operator to import/use aliases
<?php namespace foo; use My\Full\Classname as Another; // 下面的例子与 use My\Full\NSname as NSname 相同 use My\Full\NSname; // 导入一个全局类 use \ArrayObject; $obj = new namespace\Another; // 实例化 foo\Another 对象 $obj = new Another; // 实例化 My\Full\Classname 对象 NSname\subns\func(); // 调用函数 My\Full\NSname\subns\func $a = new ArrayObject(array(1)); // 实例化 ArrayObject 对象 // 如果不使用 "use \ArrayObject" ,则实例化一个 foo\ArrayObject 对象 ?>
Be careful with names in namespaces (fully qualified names including namespace separators such as FooBar and For global names that do not contain namespace separators (such as FooBar), the leading backslash is unnecessary and not allowed, because the imported name must be fully qualified and will not be based on the current naming. Relative analysis of space.
In order to simplify the operation, PHP also supports multiple use statements in one line
Example #2 Import/use aliases through the use operator, multiple use statements are included in one line
<?php use My\Full\Classname as Another, My\Full\NSname; $obj = new Another; // 实例化 My\Full\Classname 对象 NSname\subns\func(); // 调用函数 My\Full\NSname\subns\func ?>
The import operation is executed during compilation, but Dynamic class names, function names, or constant names are not.
Example #3 Import and dynamic names
<?php use My\Full\Classname as Another, My\Full\NSname; $obj = new Another; // 实例化一个 My\Full\Classname 对象 $a = 'Another'; $obj = new $a; // 实际化一个 Another 对象 ?>
Also, the import operation only affects unqualified and qualified names. Fully qualified names are not affected by imports because they are deterministic.
Example #4 Import and fully qualified name
<?php use My\Full\Classname as Another, My\Full\NSname; $obj = new Another; // 实例化My\Full\Classname类的对象 $obj = new \Another; // 实例化Another类的对象 $obj = new Another\thing; // 实例化My\Full\Classname\thing类的对象 $obj = new \Another\thing; // 实例化Another\thing类的对象 ?>

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics

In this chapter, we will understand the Environment Variables, General Configuration, Database Configuration and Email Configuration in CakePHP.

PHP 8.4 brings several new features, security improvements, and performance improvements with healthy amounts of feature deprecations and removals. This guide explains how to install PHP 8.4 or upgrade to PHP 8.4 on Ubuntu, Debian, or their derivati

To work with date and time in cakephp4, we are going to make use of the available FrozenTime class.

To work on file upload we are going to use the form helper. Here, is an example for file upload.

In this chapter, we are going to learn the following topics related to routing ?

CakePHP is an open-source framework for PHP. It is intended to make developing, deploying and maintaining applications much easier. CakePHP is based on a MVC-like architecture that is both powerful and easy to grasp. Models, Views, and Controllers gu

Visual Studio Code, also known as VS Code, is a free source code editor — or integrated development environment (IDE) — available for all major operating systems. With a large collection of extensions for many programming languages, VS Code can be c

Validator can be created by adding the following two lines in the controller.
