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PHP5中文手册
hash Functions简介Message Digest (hash) engine. Allows direct or incremental processing of arbitrary length messages using a variety of hashing algorithms. 需求The Hash extension requires no external libraries and is enabled by default as of PHP 5.1.2. It may be explicitly disabled by using the --disable-hash switch to configure. Earlier versions of PHP may incorporate the Hash extension by installing the » PECL module. 资源类型This extension defines a Hashing Context resource returned by hash_init(). 预定义常量以下常量由本扩展模块定义,因此只有在本扩展模块被编译到 PHP 中,或者在运行时被动态加载后才有效。
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