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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