Complete PHP String Reference
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.
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."
This function returns the calculated MD5 hash on success, or FALSE on failure.
| Parameter | Description |
|---|---|
| file | Required. The file to be calculated |
| raw | Optional. Specifies hex or binary output
format:
Note: This parameter was added in PHP 5.0 |
The output of the code above will be:
Store the MD5 hash of "test.txt" in a file:
In this example we will test if "test.txt" has been changed (that is if the MD5 hash has been changed):
The output of the code above could be:
Complete PHP String Reference
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