Question

I am studying PHP,OOP and i am at Static,
At this php.net/static i didnt understand this sentence

Calling non-static methods statically generates an E_STRICT level warning.

I did understand it’s Valid for methods only (not for Properties) by the sentence above,
but i didn’t succeed to understand It practically,
I’m glad if anything could please show me code that explains the sentence above,
Wishing you a pleasant week.

Answer 1

class Foo
{
    public static $my_static = 'foo';
    public $my_non_static = 'bar';

    public function staticValue() {
        return self::$my_static;
    }

    public function nonStaticValue() {
        return self::$my_non_static;
    }
}

print Foo::$my_static . "\n"; // OK
print Foo::staticValue(). "\n"; // E_STRICT

print Foo::$my_non_static . "\n"; // Fatal
print Foo::nonStaticValue(). "\n"; // Fatal

print Foo::$my_static . "\n"; is OK – static property accessed statically.

print Foo::staticValue(). "\n"; gives E_STRICT – non-static method accessed statically, but not Fatal error, because this method doesn’t access non-static properties.

Other two give Fatal error because non-static field cannot be accessed statically.