The crypt() function is used to hash the string using using algorithms like DES, Blowfish, or MD5.
Note − This function behaves different on different operating systems.
The following are some constants used together with the crypt() function.
[CRYPT_STD_DES] - Standard DES-based hash with two character salt from the alphabet "./0-9A-Za-z".
[CRYPT_EXT_DES] - Extended DES-based hash with a nine character salt consisting of an underscore followed by 4 bytes of iteration count and 4 bytes of salt.
[CRYPT_MD5] - MD5 hashing with a 12 character salt starting with $1$
[CRYPT_BLOWFISH] - Blowfish hashing with a salt starting with $2a$, $2x$, or $2y$, a two digit cost parameters "$", and 22 characters from the alphabet "./0-9A-Za-z".
[CRYPT_SHA_256] - SHA-256 hash with a 16 character salt starting with $5$.
[CRYPT_SHA_512] - SHA-512 hash with a 16 character salt starting with $6$.
Syntax
crypt(str, salt)
Parameters
str − The string to be hashed. Required.
salt − Salt string to base the hashing on. Optional.
Return
The crypt() function returns the encoded string or a string shorter than 13 characters and is guaranteed to differ from the salt on failure
The following is an example −
Example
<?php
if (CRYPT_STD_DES == 1) {
echo "DES supported = ".crypt('demo','st')."\n";
} else {
echo "DES not supported!";
}
?>The following is the output −
Output
DES supported = st7zBedJadRn2