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php的匿名函数是指什么

Jun 06, 2016 pm 08:51 PM
phpanonymous function

php的匿名函数是指什么

php的匿名函数是指什么?

php匿名函数和闭包的理解

PHP匿名函数和闭包使用的句法与普通函数相同,但匿名函和闭包数其实是伪装成函数的对象.

匿名函数:就是没有名称的函数.匿名函数可以赋值给变量,对象传递.不过匿名函数仍是函数,因此可以调用,还可以传入参数.匿名函数特别适合作为函数或方法的回调.

闭包:是指在创建时封装周围状态的函数.即使闭包所在的环境不存在了,闭包中封装的状态依然存在.

注意:理论上讲,闭包和匿名函数是不同的概念. 不过,PHP将其视作相同的概念.

 

匿名函数的语法:

 $func = function(){
     
 };//带结束符

示例demo:

 $func = function($param){
     echo($param);
 };
 $func('hello world');

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