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PHP: crypt() function

Description

The crypt() is used to encrypts a string using DES, Blowfish, and MD5 (if available) algorithms.

Version:

(PHP 4 and above)

Syntax:

crypt(string1, salt)

Parameters:

Name Description Required /
Optional		 Type
string1 The string to be encrypted. Required String
salt An optional salt string to base the hashing on. If not provided, the behavior is defined by the algorithm implementation and can lead to unexpected results. Optional String

Return value:

The encrypted string.

Value Type: string

Example: 

<?php
echo "Standard DES: ".crypt("Thank you")."\n<br />";
echo "Extended DES: ".crypt("Thank you")."\n<br />";
echo "MD5: ".crypt("Thank you")."\n<br />";
echo "Blowfish: ".crypt("Thank you");
?>

Output:

Standard DES: $1$cx1./y3.$H.8Trcy6pLgimqOWmGYrh/
Extended DES: $1$aU0.bl3.$h0A8HqJMF8gA3KwoZa6vq0
MD5: $1$Ic4.x85.$VmsInH4NRIb9WS5ofMGi80
Blowfish: $1$m00.1U3.$8BdJ6KtYIhRSMSJVqQpN71

View the example in the browser

See also

PHP Function Reference

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Next: explode



PHP: Tips of the Day

In PHP, there are two versions of logical AND and OR operators.

Operator True if
$a and $b Both $a and $b are true
$a && $b Both $a and $b are true
$a or $b Either $a or $b is true
$a || $b Either $a or $b is true

Note that the && and || opererators have higher precedence than and and or. See table below:

Evaluation Result of $e Evaluated as
$e = false || true True $e = (false || true)
$e = false or true False ($e = false) or true

Because of this it's safer to use && and || instead of and and or.