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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.

## 参数

`filename`

  The filename

`raw_output`

  When `TRUE`, returns the digest in raw binary format with a length of 16. Defaults to `FALSE`.

## 返回值

Returns a string on success, `FALSE` otherwise.

## 更新日志

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/..')`

## 参见

md5()
sha1_file()
crc32()

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