String Functions

md5

(PHP 4, PHP 5, PHP 7)

md5 — Calculate the md5 hash of a string

Warning

It is not recommended to use this function to secure passwords, due to the fast nature of this hashing algorithm. See the Password Hashing FAQ for details and best practices.

Description

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.

Return Values

Returns the hash as a 32-character hexadecimal number.

Examples

Example #1 A md5() example


<?php
$str = 'apple';

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

See Also

md5_file() - Calculates the md5 hash of a given file
sha1_file() - Calculate the sha1 hash of a file
crc32() - Calculates the crc32 polynomial of a string
sha1() - Calculate the sha1 hash of a string
hash() - Generate a hash value (message digest)
crypt() - One-way string hashing
password_hash() - Creates a password hash

String Functions