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# md5_file

(PHP 4 >= 4.2.0, PHP 5)

md5_file -- Calculates the md5 hash of a given file

## Description

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. If the optional raw_output is set to `TRUE`, then the md5 digest is instead returned in raw binary format with a length of 16.

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

This function has the same purpose of the command line utility md5sum.

See also md5(), crc32(), and sha1_file().

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