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# sha1_file

(PHP 4 >= 4.3.0, PHP 5)

sha1_file -- Calculate the sha1 hash of a file

## Description

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. Upon failure, `FALSE` is returned. If the optional raw_output is set to `TRUE`, then the sha1 digest is instead returned in raw binary format with a length of 20.

> 備注: The optional raw_output parameter was added in PHP 5.0.0 and defaults to `FALSE`

See also sha1(), crc32(), and md5_file()

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