這些類型聲明隻能(néng)在(zai)類中(zhong)使用(yong)。
self ¶
The value must be an instanceof the same class as the one in which the type declaration is used.
parent ¶
值必須昰(shi) instanceof 使用(yong)了(le)類型聲明的(de)父級類。
static ¶
static is a return-only type which requires that the value returned must be an instanceof the same class as the one the method is called in. 自 PHP 8.0.0 起可(kě)用(yong)。
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