sha1

Description

string sha1 ( string str [, bool raw_output])

Calculates the sha1 hash of str using the US Secure Hash Algorithm 1, and returns that hash. The hash is a 40-character hexadecimal number. 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.

注: The optional raw_output parameter was added in PHP 5.0.0 and defaults to FALSE

例子 1. A sha1() example
<?php $str = 'apple'; if (sha1($str) === 'd0be2dc421be4fcd0172e5afceea3970e2f3d940') { echo "Would you like a green or red apple?"; exit; } ?>

See also sha1_file(), crc32(), and md5()