md5()

md5() — Calculate the md5 hash of a string.

Built-in function of PHP 8.5. The manual lists it as available in PHP 4, PHP 5, PHP 7, PHP 8. This page is the reference card: signature, parameters and return value, plus the changelog and the example the manual provides.

What it does

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

Signature

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

Parameters

Parameter	Type	What it takes
$string	string	The string.
$binary	bool	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 value

Returns the hash as a 32-character hexadecimal number.

Example

A runnable snippet:

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