直接从PHP数组调用函数

Question

I am trying to call a PHP function via an array like so:

$x = (object) array(
    "one" => "value",
    "two" => "value2",
    "three" => function() {
        return "return_value";
    }
);

echo($x->three());

From this I receive the error:

<b>Fatal error</b>:  Call to undefined method stdClass::three()

I've searched a bit and cannot find any documentation on this, however I ran this through

php -l filename.php

which found no syntax errors.

I would like to know if what I'm trying to do is possible (end goal is to call a function with parameters from an array). Is anybody able to shed some light on this?

Thanks

Note, I have also tried:

function foo() {
    return "bar";
}
$x = (object) array(
    "foo" => foo
);
...

which leads to the same result.

Answer 1

The type of method you created is classified as an anonymous function and is represented by the Closure class and thus inherits its properties, which includes the invoke method as specified by Amal Murali.

You have two ways of calling this function:

1. echo $x->three->__invoke();
2. echo call_user_func( $x->three );

If you need to pass arguments, you can call $x->three->__invoke( $args ); or call_user_func( $x->three, $args1, $args2 );.