在php中使用__call方法时，'方法名称必须是字符串'

Question

I am using the magic __call method in PHP. Sometimes the function I call is a number. For example the class name is example, then sometimes I want to call example::32

Is this possible or should I look at another alternative.

Answer 1

Sure it's possible. You just need to change the call syntax. $foo->32() is not valid and will give a fatal error. But $foo->{'32'}() is valid syntax. Now, you can't define a function 32, but you can use __call to execute it...

class Foo {
    public function __call($f, $args) {
        echo $f;
    }
}

$foo = new Foo;

$foo->32();  //Fatal Error

$foo->{32}(); //Fatal Error

$foo->{'32'}(); // "32" is printed

$x = 32;
$foo->$x(); //Fatal Error

$x = '32';
$foo->$x(); // "32" is printed

$x = 32;
$foo->{(string)$x}(); // "32" is printed

call_user_func(array($foo, '32')); // "32" is printed

Or in 5.3 with static methods, it gets a bit harder:

class Foo {
    public static function __callStatic($f, $args) {
        echo $f;
    }
}

Foo::32();  //Fatal Error
Foo::{32}(); //Fatal Error
Foo::{'32'}(); //Fatal Error

$x = 32;
Foo::$x(); //Fatal Error

$x = '32';
Foo::$x(); // "32" is printed

$x = 32;
Foo::{(string)$x}(); //Fatal Error

call_user_func(array('foo', '32')); //Fatal Error