Precautions for using the call_user_func function in PHP, calluserfunc_PHP tutorial

Notes on using the call_user_func function in php, calluserfunc

The example in this article describes the precautions for using the call_user_func function in PHP. Share it with everyone for your reference. The specific analysis is as follows:

Notes on the call_user_func function: parse error: syntax error, unexpected t_list, expecting t_string in. When using this function today, I kept getting prompted with the above problem. The official manual did not introduce the precautions for using it.

Attachment: mixed call_user_func(callback $function [, mixed $parameter [, mixed $... ]]). You can pass any built-in or user-defined function, except language structures such as array(), echo() ,empty(),eval(),exit(),isset(),list(),print() and unset().

My problem is that there is a method name called list in the object, so it conflicts with the language structure list() of the PHP tutorial.

Look at the example application: the call_user_func function is similar to a special method of calling a function. The usage method is as follows:

Copy code The code is as follows:

function a($b,$c)
{ 
echo $b;
echo $c;
} 
call_user_func('a', "111","222");
call_user_func('a', "333","444");
//Display 111 222 333 444

It is strange to call the method inside the class. It actually uses array. I don’t know what the developer thought about it. Of course, new is omitted, which is also very innovative. The code is as follows:

Copy code The code is as follows:

class a { 
function b($c)
{ 
echo $c;
} 
} 
call_user_func(array("a", "b"),"111");
//Display 111

The call_user_func_array function is very similar to call_user_func, except that the parameters are passed in a different way to make the structure of the parameters clearer. The code is as follows:

Copy code The code is as follows:

function a($b, $c)
{ 
echo $b;
echo $c;
} 
call_user_func_array('a', array("111", "222"));
//Display 111 222

I hope this article will be helpful to everyone’s PHP programming design.

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