預設常數
以下常數由擴充功能定義,因此只有在擴充功能被編譯到
PHP 中,或者在執行時被動態載入後才有效。
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HASH_HMAC
(integer)
-
Optional flag for hash_init().
Indicates that the HMAC digest-keying algorithm should be
applied to the current hashing context.
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