PHP `self` ? `static`: `new static()`? `new self()`? ?? ?????
Dec 14, 2024 am 12:15 AM
? self? ? static? ?? ??
PHP??? self? static? ??? ??? ??? ????? ???? ? ??? ????????. ?? ??? ????. ??? ? ? ??? ???? ??? ??? ????.
new self vs. new static
- self? new ???? ??? ???? ?????. , ?? ??? ?? ?? ??? ????
- PHP 5.3? ??? static? new? ???? ???? ??? ???? ?????. ?? ?? ??? ????
PHP 5.2? ?? ??
PHP 5.3 ?????? ?? ?? ???? ?? ??? ??? PHP 5.2? ??? ? new self($options)? ??? new static($options)? ??? ??? ?? ?? ? ????. self? ?? new? ??? ??? ???? ???? ?? static? ?? ??? ??? ???? ???? ?????.
?:
?? ??? ?????. PHP 5.2:
class A {
public static function create() {
return new self();
}
}
class B extends A {}
$object = B::create(); // $object is of class A, not B
PHP 5.3??? ??? ??? ??? B? ??? ??????? ????. static? ?? ???? ????? ????.
?? ?? ??
PHP 5.2? ? ?? ????? ???? ???? ? ??? ?? ?? ??? ?? ?? ??????. ???? ?? ?? ?? ???? ???? ?? ?? ????.
? ??? PHP `self` ? `static`: `new static()`? `new self()`? ?? ?????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!
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PHP?? ?? ? ??? ????? ?????????
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