String Functions
PHP Manual

sha1

Calculate the sha1 hash of a string

Warning

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.

Description

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.

Return Values

Returns the sha1 hash as a string.

Examples

Example #1 A sha1 example

<?php
$str = 'apple';

if (sha1($str) === 'd0be2dc421be4fcd0172e5afceea3970e2f3d940') {
    echo "Would you like a green or red apple?";
}
?>

See Also

  • sha1_file
  • crc32
  • md5
  • hash
  • crypt
  • password_hash