PHP calling function sample via string _php tutorial

1. Call_user_func

Copy the Code code 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
?>

Call the method inside the class is rather strange, incredibly using an array, do not know how developers think, of course, save new, is full of innovative:

Copy the Code code as follows:
Class A {
Function B ($c) {
Echo $c;
}
}
Call_user_func (Array ("A", "B"), "111");

Showing 111
?>

2. Call_user_func_array

The Call_user_func_array function is similar to the Call_user_func, except that the parameter is passed in a different way, allowing the structure of the parameter to be clearer:
Copy the Code code as follows:
function A ($b, $c) {
Echo $b;
Echo $c;
}
Call_user_func_array (' A ', Array ("111", "222"));

Showing 111 of 222
?>


The Call_user_func_array function can also invoke methods within the class.
Copy the Code code as follows:
Class classa{
function BC ($b, $c) {
$BC = $b + $c;
Echo $BC;
}
}
Call_user_func_array (Array (' ClassA ', ' BC '), Array ("111", "222"));

Showing 333
?>

Both the Call_user_func function and the Call_user_func_array function support references, which makes them more functionally consistent with normal function calls:

Copy the Code code as follows:
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

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