PHP 5.2?? 5.3?? ??????: `new self()`? `new static()`? ???? ??????
Dec 18, 2024 pm 03:40 PM
PHP?? "??? ??"? "??? ??"? ??? ??
PHP 5.3 ?????? PHP 5.2? ???? ?? ??? ? ????. , ?? ??? ??? ?? ?????. ??? ? ??? new static($options) ??? ?? ?? ?? ???? ???? ????.
"? ??"? ??? ??? ??
return new static($options)? return new self($options)? ???? ??? ??? ??? ????. PHP 5.3? ??? ?? ?? ???? ???? ???? ???? ???? ???? static ???? ???? ???? ???? ??? ? ????. ??? PHP 5.2? ? ??? ???? ????.
"? ??"? "? ??"? ?? ???
- ??: new ???? ?? ???? ?????. ???????.
- ??: ?? ?? ???(PHP 5.3 )?? ???? ??? ???? ?????.
?:
?? ??? ?????. code:
class A {
public static function get_self() {
return new self();
}
public static function get_static() {
return new static();
}
}
class B extends A {}
echo get_class(B::get_self()); // A
echo get_class(B::get_static()); // B
echo get_class(A::get_self()); // A
echo get_class(A::get_static()); // A
? ??? get_self? ?? ??? ???? A? ???? ???? ??? A? ??????. ??? get_static? ?? ??? ???? ?? ???? ??????. ???? ??? ?? ?????(?: ? ??? B ??).
??
PHP 5.2? ?? ?? ?? ???? ?? ???? ?? ??? ????. new static? new self? ??? ??? ??? ???? ????. PHP 5.3 ??? ?? ???? ??? ? ??? ??? ?? ???? ???? ?? ?????.
? ??? PHP 5.2?? 5.3?? ??????: `new self()`? `new static()`? ???? ??????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!
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