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? ??? ?? PHP ???? PHP? `::class`? ???? ?? ???? ??? ??? ??????

PHP? `::class`? ???? ?? ???? ??? ??? ??????

Nov 30, 2024 am 08:12 AM

What is PHP's `::class` and How Does it Improve Code Clarity and Management?

PHP? ::class ??: ??? ??? ?? ????? ??

?? ???? ??? :: PHP? ????? ???? ?? class ???? ???????. ??? ???? ????? ?? ??? ??? ??? ???????.

::class? ??????

PHP? ::class ??? ???? ??????? ???? ???? ???? ??? ?????. ? ??? PHP 5.5?? ???????.

::class

? ???? ? ?? ?? ??? ?????.

  1. ??? ?? ??? ? ??: ??? ??? ??? ???? ???? ?? ??? ??? ? ????. ::class ???? ?????. ? ?? ??? IDE? ??? ??? ???? ????? ? ???? ?? ???? ??? ????? ???? ???.
  2. ??? ??? ??: use ???? ?? ???? ::class ???? ???? ?? ??? ???? ??? ???? ??? ? ????. ?:
use \App\Console\Commands\Inspire;

//...

protected $commands = [
    Inspire::class, // Equivalent to "App\Console\Commands\Inspire"
];

?? ??

?? ??? ?? ??? ::class ???? ??? ?? ??? ???. Late Static Binding?? ??? ??? ???. CLASS ?? ??? ?? static::class? ???? ?? ??? ??? ?? ??? ??? ??? ? ????. ??? ???? ??? ??? ??? ? ?? ?????.

?: ?? ?? ???

class A {

    public function getClassName(){
        return __CLASS__;
    }

    public function getRealClassName() {
        return static::class;
    }
}

class B extends A {}

$a = new A;
$b = new B;

echo $a->getClassName();      // A
echo $a->getRealClassName();  // A
echo $b->getClassName();      // A
echo $b->getRealClassName();  // B

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