String Functions

md5

(PHP 4, PHP 5, PHP 7)

md5 — Calculate the md5 hash of a string

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?";
}
?>

Notes

Note: 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.

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