md5

Calculate the md5 hash of a string (PHP 3, PHP 4 )
string md5 ( string str [, bool raw_output] )

Calculates the MD5 hash of str using the » RSA Data Security, Inc. MD5 Message-Digest Algorithm, and returns that hash. The hash is a 32-character hexadecimal number. 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.

Note:

The optional raw_output parameter was added in PHP 5.0.0 and defaults to FALSE

Example 924. A md5() example

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<?php
$str = 'apple';

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

See also crc32(), md5_file(), and sha1().

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