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# sha1_file

(PHP 4 >= 4.3.0, PHP 5)

sha1_file -- Calculate the sha1 hash of a file

## 说明

string sha1_file ( string filename [, bool raw_output] )

Calculates the sha1 hash of filename using the US Secure Hash Algorithm 1, and returns that hash. The hash is a 40-character hexadecimal number.

## 参数

filename

  The filename

raw_output

  When `TRUE`, returns the digest in raw binary format with a length of 20. 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 sha1_file('http://example.com/..')

## 参见

sha1()
md5_file()
crc32()

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