How to use PHP is_callable function

PHP's is_callable is used to detect whether a function or a class method can be executed, in official documents, to detect whether the parameter is a legitimate callable structure, as shown in the code.

Class A
{public
function __construct () {
echo ' Class: '. Get_called_class ();
The public
function cc () {
$a = 3;
return $a;
}
}
$a = new A;
$test = is_callable (Array (' A ', ' cc '));
Var_dump ($test); exit;
Printed result:
class:a
Boolean True

Official Example:

function someFunction ()

{

}

$functionVariable = ' someFunction ';

Var_dump (Is_callable ($functionVariable, False, $callable _name));  BOOL (TRUE)

echo $callable _name, "\ n"; SomeFunction////

Array containing a method

//

class SomeClass {

functi On SomeMethod ()

{

}

}

$anObject = new SomeClass ();

$methodVariable = Array ($anObject, ' SomeMethod ');

Var_dump (Is_callable ($methodVariable, True, $callable _name));  BOOL (TRUE)

echo $callable _name, "\ n"; Someclass::somemethod

The official example is a detection function, a method for detecting classes, and a more specific usage.

Example

The demo code is as follows:

<?php

class Test {

static function A () {return

"Test";

}

}

Class ABC {public

function A ($Object, $funcName) {

if (!is_callable ($Object, $funcName)) {//here Array ($  Object, $funcname), equivalent to $object:: $funcname invoke $object's $funcname method

echo ("Error");

}else {

echo ("OK");

}

}

$abc =new ABC ();

$ABC->a ("Test", "AA"), there is no AA method under//test class, output error

$abc->a ("Test", "a"),//test class has a method, output OK

?>

OK, the use of this function