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PHP md5_file() Function

PHP md5_file() function is used to generate the md5 hash value of a given input file. On success of the operation this function returns a hash string otherwise it returns FALSE. It accepts two parameters out of which one is required, which is the given input file and other one is an optional parameter.

Syntax:-

  md5_file( $file, $raw );

Parameter Values

Parameter	Description
String	This is a required parameter. This parameter contains the file which is to be converted into hash.
RawOutput	This is an optional parameter. This parameter specifies the hex or binary output format. It is of Boolean type. TRUE - Raw 16 character binary format. FALSE - 32 character hex format. (Default)

Here is an example of md5_file() function in PHP:

<html>
<body>

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

Output:
01b0553875b7fd8bf8daa0245607055c

Here is an example of using md5_file() function in PHP for file verification:

First we will store the md5 hash into the file.

<html>
<body>

<?php
$file = "file.txt";
$md5file = md5_file($file);
file_put_contents("md5file.txt",$md5file);      // storing the md5 hash file
?>  
 
</body>
</html>

Then get the md5 file & match it with the hash value.

<html>
<body>

<?php
$md5file = file_get_contents("md5file.txt");
if (md5_file("file.txt") == $md5file)
  {
  echo "The file is OK.";
  }
else
  {
  echo "The file has been altered.";
  }
?>
 
</body>
</html>

Output:
The file is OK.

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