Detailed explanation of anonymous functions and callback functions in php

Anonymous function is a function without a name. You can assign the function to a variable and then call it.

The callback function refers to a function that is used as a parameter value for another function.

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Code examples are as follows:

//匿名函数 没名称的函数
$a=function (){
echo "www.php.cn";
}
$a();
//回调函数 函数名作为参数供其他函数使用
call_user_func("函数名",参数)
function $a(){
echo "www.php.cn";
}
call_user_func("a",参数)
//也相当于可以传入一个匿名函数进去使用

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