PHP sha1_file() Function

In this chapter you will learn:

1. Definition for PHP sha1_file() Function
2. Syntax for PHP sha1_file() Function
3. Parameter for PHP sha1_file() Function
4. Return for PHP sha1_file() Function
5. Example - Calculate the SHA-1 hash of the text file "test.txt"
6. Example - Check the sha1 value

Definition

The sha1_file() function calculates the SHA-1 hash of a file.

Syntax

PHP sha1_file() Function has the following syntax.

Parameter

Possible values for raw.

• TRUE - Raw 20 character binary format
• FALSE - Default. 40 character hex number

Return

PHP sha1_file() Function Returns the calculated SHA-1 hash on success, or FALSE on failure

Example 1

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

<?php/*j a  va 2s.  c o  m*/
$filename = "test.txt";
$sha1file = sha1_file($filename);
echo $sha1file;
?>

Example 2

Store the SHA-1 hash of "test.txt" in a file and test if "test.txt" has been changed (that is if the SHA-1 hash has been changed):

<?php/*from j  a  v  a  2  s. co m*/
$sha1file = sha1_file("test.txt");
file_put_contents("sha1file.txt",$sha1file);

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

Next chapter...

What you will learn in the next chapter:

1. Definition for PHP stat() Function
2. Syntax for PHP stat() Function
3. Parameter for PHP stat() Function
4. Return for PHP stat() Function
5. Note on PHP stat() Function
6. Example - returns information about a file.

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