PHP sha1_file() Function

The sha1_file() function is an inbuilt function in PHP which is used to generate the SHA-1 hash of the text file. This function returns a string on success and returns FALSE otherwise. Syntax:

sha1_file ( $file, $raw )

Parameters Used: This function accepts two parameters as mentioned above and described below.

• $file: It is a mandatory parameter which specifies the file for SHA1 hash.
• $raw: It is an optional parameter which specifies boolean values.
  • TRUE - Raw 20 character binary format.
  • FALSE - By Default. 40 character long hex number.

Return Values: The function returns a string of SHA1 hash on success and returns FALSE otherwise. Suppose there is a file named "gfg.txt" which has the below content.

Publish your own articles and share knowledge with the world!!

Below programs illustrate the sha1_file() function. Program 1: php

<?php
// PHP  program to illustrate 
// sha1_file() function

$gfg = sha1_file("gfg.txt");

echo $gfg;

?>

Output:

989aa47ec7ea68605dca25b499c8414e283e8354

Program 2: With optional parameter $raw with different values TRUE and FALSE. php

<?php
// PHP  program to illustrate 
// sha1_file() function

// Without optional parameter
echo sha1_file("gfg.txt") . "\n";

// with optional parameter $raw = FALSE (by default)
// no changes in result
echo sha1_file("gfg.txt", FALSE) . "\n";


// with optional parameter $raw = TRUE 
// result changed
echo sha1_file("gfg.txt", TRUE) . "\n";

?>

Output:

989aa47ec7ea68605dca25b499c8414e283e8354
989aa47ec7ea68605dca25b499c8414e283e8354
???~??h`]?%???AN(>?T

Reference: https://www.php.net/manual/en/function.sha1-file.php