w3resource

PHP: sha1_file() function

Description

The sha1_file() function is used to calculate the sha1 hash (Using US Secure Hash Algorithm 1 ) of a file.

Version:

(PHP 4 and above)

Syntax:

sha1_file (file_name, raw_output)

Parameter:

Name Description Required /
Optional
Type
file_name The input file name. Required String
raw_output If TRUE sets raw 20 characters binary format. If FALSE (default) sets raw 40 character hex number format. Optional Boolean

Return value:

Returns a string on success, FALSE otherwise.

Value Type: String.

Pictorial Presentation

php-string-sha1_file()

Example:

<?php
$file_handler = 'testvf.txt';
$sha1_file = sha1_file($file_handler);
echo $sha1_file;
?>

Output:

833cd96367d51bb065f486f4b2bd7fe8bcb70996

View the example in the browser

See also

PHP Function Reference

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PHP: Tips of the Day

In PHP, there are two versions of logical AND and OR operators.

Operator True if
$a and $b Both $a and $b are true
$a && $b Both $a and $b are true
$a or $b Either $a or $b is true
$a || $b Either $a or $b is true

Note that the && and || opererators have higher precedence than and and or. See table below:

Evaluation Result of $e Evaluated as
$e = false || true True $e = (false || true)
$e = false or true False ($e = false) or true

Because of this it's safer to use && and || instead of and and or.