String Functions
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PHP md5() Function

Topic: PHP String ReferencePrev|Next

Description

The md5() function calculates the MD5 (Message Digest Algorithm 5) hash of a string.

This function calculates the MD5 hash of string using the RSA Data Security, Inc. MD5 Message-Digest Algorithm, and returns that hash. To calculate the MD5 hash of a file, use the md5_file() function.

The following table summarizes the technical details of this function.

Return Value: Returns the MD5 hash on success, or FALSE on failure.
Version: PHP 4+

Warning: Using the md5() function to secure passwords is not recommended, due to the fast nature of this hashing algorithm. Use the password_hash() function to hash passwords.


Syntax

The basic syntax of the md5() function is given with:

md5(string, raw_format);

The following example shows the md5() function in action.

<?php
// Sample string
$str = "Sparrow";

// Calculating the hash
echo md5($str);
?>

Parameters

The md5() function accepts the following parameters.

Parameter Description
string Required. Specifies the input string.
raw_format Optional. If set to true, it returns the hash in raw binary format with a length of 16. Default value is false which returns the hash as a 32-character hexadecimal number.

More Examples

Here're some more examples showing how md5() function actually works:

The following example calculates the MD5 hash in different formats.

<?php
// Sample string
$str = "Sparrow";

// Calculating the hash
echo "MD5 hash as a 32-character hexadecimal number: ".md5($str)."<br>";
echo "MD5 hash in 16-character raw binary format: ".md5($str, TRUE);
?>

The following example checks whether the two MD5 hashes are identical or not.

<?php
// Sample string
$str = "Sparrow";

// Test if two hashes are Identical
if(md5($str) === "ef5a30521df4c0dc7568844eefe7e7e3"){
    echo "Sparrows are very social and they live in flocks.";
}
?>
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