How to use the php function call_user_func

I browsed the documentation some time ago and found an interesting PHP function: call_user_func. This article mainly shares with you how to use the PHP function call_user_func. I hope it can help you.

Function function: This function is mainly used to call the function through function name

For example:

function test(){
    echo "hello world\n";
}
$methodName = "test";
call_user_func($methodName);
上面的语句执行后相当于直接调用test()，不过是可以通过函数名来调用函数。同时也可以用这种方法来调用：
1
2
$methodName = "test";
$methodName();

generated The result is the same, and this method will be slightly better in performance than the above method.

In addition to calling functions, you can also call object methods:

class T{
    static public function test(){
        echo "hello world\n";
    }
}
//php 5.3以前需要这样调用
call_user_func("T::test");
//php 5.3以后，可以将class和method传入一个数组再将数组传给call_user_func方法
call_user_func(array("T", "test"));

The above execution effect is the same

call_user_func can also be used with anonymous functions such as:

function call_func(){
    foreach(func_get_args() as $func){
        call_user_func($func);
    }
}
call_func(function(){
    echo "anonymous function\n";
});

The above function can also call multiple functions at the same time.

Related recommendations:

Detailed explanation of usage examples of php functions call_user_func and call_user_func_array

##Summary of call_user_func_array() function definition and usage

php call_user_func function

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