md5

(PHP 4, PHP 5, PHP 7)

Calculate the md5 hash of a string

string md5 ( string $str [, bool $raw_output = false ] )

Calculates the MD5 hash of str using the » RSA Data Security, Inc. MD5 Message-Digest Algorithm, and returns that hash.

Parameters:

str

The string.

raw_output

If the optional raw_output is set to TRUE, then the md5 digest is instead returned in raw binary format with a length of 16.

Returns:

Returns the hash as a 32-character hexadecimal number.

Notes:

Secure password hashing

It is not recommended to use this function to secure passwords, due to the fast nature of this hashing algorithm. See here for details.

Examples:

A md5() example

<?php
$str = 'apple';

if (md5($str) === '1f3870be274f6c49b3e31a0c6728957f') {
    echo "Would you like a green or red apple?";
}
?>