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md5_file() function in PHP

The md5_file() function is used to calculate the md5 hash of a given file. Let us first learn what is MD5 −

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.

 -- Ref: From RFC 1321 - The MD5 Message-Digest Algorithm −

Syntax

md5_file(file_name, raw)

Parameters

  • file_name − Specifies the file for SHA1 hash

  • raw − Specify Boolean values −

  • TRUE - Raw 16 character binary format

    FALSE - Default. 32 character hex number

Return

The md5_file() function returns a string on success, else FALSE.

Example

The following is an example −

<?php
   $file = "Md5.txt";
   $md5file = md5_file($file);
   echo $md5file;
?>

Output

The following is the output −

1e5gbjhwbdk3enkjnd9bkjbw82kjbs