(PHP 4 >= 4.3.0, PHP 5, PHP 7)
Calculate the sha1 hash of a string
string sha1 ( string $str [, bool $raw_output = false ] )
Calculates the sha1 hash of str
using the » US Secure Hash Algorithm 1.
Parameters:
str
The input string.
raw_output
If the optional raw_output
is set to TRUE
, then the sha1 digest is instead returned in raw binary format with a length of 20, otherwise the returned value is a 40-character hexadecimal number.
Returns:
Returns the sha1 hash as a string.
Notes:
Secure password hashing
It is not recommended to use this function to secure passwords, due to the fast nature of this hashing algorithm. See here for details.
Examples:
A sha1() example
<?php $str = 'apple'; if (sha1($str) === 'd0be2dc421be4fcd0172e5afceea3970e2f3d940') { echo "Would you like a green or red apple?"; } ?>
See also:
crc32() -
md5() -
hash() -
crypt() -
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