md5

    (PHP 4, PHP 5, PHP 7, PHP 8)

    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

    md5(string $string, bool $binary = false): string

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

    Parameters

    string

    The string.

    binary

    If the optional binary 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

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