PHP | hash_file() Function

Hello folks! welcome back to a new edition of our tutorial on PHP. In this tutorial guide, we are going to be studying about the PHP hash_file() Function.

The built-in PHP hash_file() function returns hash of the given file contents. The return value will be a string of lowercase hexits.

Syntax

Following below is the syntax to use this function -

hash_file ( string $algo , string $filename [, bool $raw_output = FALSE ] ) : string

READ: PHP | hash_equals() Function

Parameter Details

Sr.No	Parameter & Description
1	algo Name of the hashing algorithm. There is a big list of algorithm available with hash, some important ones are md5, sha256, etc. To get the full list of algorithms supported, use the hashing function hash_algos()
2	filename The file path, the contents of which are to be converted to hash.
3	raw_output By default the value is false and hence it returns lowercase hexits values. If the value is true, it will return raw binary data.

Return Value

This built-in PHP function returns a string of lowercase hexits if the raw_output is false, otherwise it returns raw binary data.

PHP Version

This PHP function works from PHP version greater than 5.1.2.

Example1

To generate hash of a given file contents -

<?php
   file_put_contents('filetest.txt', 'Welcome to Webdesigntutorialz'); 
   // create file filetest.txt with content : 'Welcome to Webdesigntutorialz'
   echo hash_file('md5', 'filetest.txt');
?>

Output

When the above code is executed, it will produce the following result -

98c299a76c4b81497677fc5aa861166d

Example2

Testing hash() and hash_file() for some contents -

<?php
   echo hash("md5", 'Welcome to Webdesigntutorialz');
   echo "<br/>";
   file_put_contents('filetest.txt', 'Welcome to Webdesigntutorialz'); 
   // create file filetest.txt with content : 'Welcome to Webdesigntutorialz'
   echo hash_file('md5', 'filetest.txt');
?>

Output

When the above code is executed, it will produce the following result -

98c299a76c4b81497677fc5aa861166d<br/>98c299a76c4b81497677fc5aa861166d

Example3

Using hash_file() for image -

<?php
   echo hash_file('md5', 'https://www.webdesigntutorialz.com/images/tp-logo-diamond.png')
?>

Output

When the above code is executed, it will produce the following result -

0bdba90368971801a0d5c7e81679cdc9

READ: PHP | hash_algos() Function

Alright guys! This is where we are rounding up for this tutorial post. In our next tutorial guide, we are going to be discussing about the PHP hash_final() Function.

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