PHP code to call function through string

Learn php to call functions through strings.

1. call_user_func

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, actually using array , I don’t know how the developers thought about it. Of course, new is omitted, which is also full of novelty:

class a {
 function b($c){
 echo $c;
 }
} // www.jbxue.com
call_user_func(array("a", "b"),"111");

//Display 111
?>

2. call_user_func_array

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:

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

//Display 111 222
?>

The call_user_func_array function can also be called inside the class The method of

Class ClassA{
 function bc($b, $c) {
 $bc = $b + $c;
 echo $bc;
 }
} // www.jbxue.com
 call_user_func_array(array('ClassA','bc'), array("111", "222"));

//Display 333
?>

Both the call_user_func function and the call_user_func_array function are supported quotes, which makes them more functionally consistent with ordinary function calls:

function a(&$b){
 $b++;
}
$c = 0;
call_user_func('a', &$ c);
echo $c;//Display 1
call_user_func_array('a', array(&$c));
echo $c;//Display 2