(PHP 4 >= 4.3.0, PHP 5, PHP 7)
sha1 — Calculate the sha1 hash of a string
It is not recommended to use this function to secure passwords, due to the fast nature of this hashing algorithm. See the Password Hashing FAQ for details and best practices.
$str
[, bool $raw_output = FALSE
] )
Calculates the sha1 hash of str using the
» US Secure Hash Algorithm 1.
strThe 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 the sha1 hash as a string.
Example #1 A sha1() example
<?php
$str = 'apple';
if (sha1($str) === 'd0be2dc421be4fcd0172e5afceea3970e2f3d940') {
echo "Would you like a green or red apple?";
}
?>