PHP string sha1_file() Function

The sha1_file() function is predefined PHP string function. It is used to calculate the SHA-1 hash of a file. It uses he US secure Hash Algorithm 1 and calculate the ha1 hash US secure Hash Algorithm 1.

The hash is a 40 character hexadecimal number.

It returns the calculated SHA-1 hash on success or False on failure.

Syntax:

Parameter	Description	Required/Optional
File	Specify file to be calculated.	Required
raw	Specify hex or binary output format: TRUE : Raw 20 character binary format. FALSE : Default. 40 character hex number.	Optional

Example 1

Save it: "test.txt"

Save it: test.php

<?php
$filenm = "test.txt";
echo "Your filename is:". $filenm;
echo "<br>";
echo "By using sha1_file() function:".sha1_file($filenm);
?>

Output:

    Your filename is:test.txt
    By using sha1_file()    function:a02e266c6f3a8ff0c4250e502828c4ebf179d252

Example 2

Save it: "test.txt"

Save it: "sha1file.txt"

Save it: "index.php"

<?php
$sha1file = sha1_file("test.txt");
file_put_contents("sha1file.txt",$sha1file);
?>

Save it: "test.php "

<?php
$sha1file = file_get_contents("sha1file.txt");
if (sha1_file("test.txt") == $sha1file){
  echo "The file is ok.";
  }
else{
  echo "The file has been changed.";
  }
?>

Output: