===== Syntax =====

<code php>string crypt(string $str [, string $salt])</code>

//(PHP 4 >= 4.01, PHP 5)//

^ $str | Source text or binary string for generating a crypt string. |
^ $salt | Optional salt string (usually 2 characters long) to use for the encryption string. |
^ RETURNS | Encrypted string of characters used to verify the original data. |

===== What it Does =====

Calculates a hash or a crypt value based on the source text or binary string.  This does a one-way encryption meaning that there is no way to undo the encryption (using the crypted result.)  This uses the local machines standard Unix DES encryption method.  Similar to the [[crc32]] function, this will create a checksum value to verify the integrity of the data.

===== Example =====

<code php>
// calulate the crypted string from a form post
$chksum = crypt($_POST['body']);
echo sprintf('The crypt result is: %u', $chksum);
</code>