The md5_file() function calculates the MD5 hash of a file.The md5_file() function uses the RSA Data Security, Inc. MD5 Message-Digest Algorithm.
string md5_file ( string $filename [, bool $raw_output = FALSE ] )
From RFC 1321 - The MD5 Message-Digest Algorithm: "The MD5 message-digest algorithm takes as input a message of arbitrary length and produces as output a 128-bit "fingerprint" or "message digest" of the input. The MD5 algorithm is intended for digital signature applications, where a large file must be "compressed" in a secure manner before being encrypted with a private (secret) key under a public-key cryptosystem such as RSA."
To calculate the MD5 hash of a string, use the md5() function.
Parameter | Description |
---|---|
filename | The filename |
raw_output | When TRUE, returns the digest in raw binary format with a length of 16. |
Returns a string on success, FALSE otherwise.