Calculate the SHA-1 hash of the text file "test.txt" in PHP

Description

The following code shows how to calculate the SHA-1 hash of the text file "test.txt".

Example

/*w  w  w . j av  a 2s . com*/
<?php
    $filename = "test.txt";
    $sha1file = sha1_file($filename);
    echo $sha1file;
?>

The code above generates the following result.