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PHP Manual :: sha1

sha1_file || similar_text || String Functions || PHP Manual

(PHP 4 >= 4.3.0, PHP 5, PHP 7)

sha1Calculate 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.



The input string.


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.


Example #1 A sha1() example


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


Note: 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.

See Also

  • sha1_file() - Calculate the sha1 hash of a file
  • crc32() - Calculates the crc32 polynomial of a string
  • md5() - Calculate the md5 hash of a string
  • hash() - Generate a hash value (message digest)
  • crypt() - One-way string hashing
  • password_hash() - Creates a password hash

sha1_file || similar_text || String Functions || PHP Manual
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