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# sha1

(PHP 4 >= 4.3.0, PHP 5)

sha1 -- Calculate the sha1 hash of a string

## 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.

> 備注: The optional raw_output parameter was added in PHP 5.0.0 and defaults to `FALSE`

示範 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()

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