Use keyword in various aspects of life in PHP

The usekeyword is not only involved in the oriented process ofPHP, It also steals the show inPHPobject-oriented. In the actual development process, it is also spread throughout the source code. This article will make a summary of theusekeyword.

1. Reference for namespace

2. Keyword for alias

namespace space; function display(){} class Man{} const PI = 3.14; namespace space1; class Man{} //引入空间元素 //use space\Man; //错误：当前空间已经存在Man use space\Man as M; use function space\display as dis; use const space\PI as D;

3. Used for the introduction of trait feature capabilities

testTrait(); ?>

4. In anonymous functions Reference local variables in

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