PHP 手册
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md5_file

(PHP 4 >= 4.2.0, PHP 5)

md5_file -- Calculates the md5 hash of a given file

说明

string md5_file ( string filename [, bool raw_output] )

Calculates the MD5 hash of the file specified by the filename parameter using the RSA Data Security, Inc. MD5 Message-Digest Algorithm, and returns that hash. The hash is a 32-character hexadecimal number.

filename: The filename
raw_output: When TRUE, returns the digest in raw binary format with a length of 16. Defaults to FALSE.

Returns a string on success, FALSE otherwise.

版本	说明
5.0.0	Added the `raw_output` parameter
5.1.0	Changed the function to use the streams API. It means that you can use it with wrappers, like `md5_file('http://example.com/..')`

后退	起点	前进
ltrim	上一级	md5