PHP | hash_equals() 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_equals() Function.

The PHP hash_equals() function compares two strings at the same time and returns true if equal.

Syntax

Following below is the syntax to use this function -

hash_equals ( string $known_string , string $user_string ) : bool

READ: PHP | hash_copy() Function

Parameter Details

Sr.No	Parameter & Description
1	known_string The string which will be compared.
2	user_string The string given by user.

Return Value

This built-in PHP function returns true if the strings are equal and false if not.

PHP Version

This PHP function works from PHP version greater than 5.6.0.

Example1

The following example below illustrates the usage of the hash_equals() function -

<?php
   $known_str = crypt('webdesigntutorialz','$5$rounds=1000$salttest$');
   $usr_str   = crypt('webdesigntutorialz','$5$rounds=1000$salttest$');
   $res = hash_equals($known_str, $usr_str); 
   var_dump($res);
?>

Output

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

bool(true)

Example2

Comparing hash using the hash_equals() function -

<?php
   $known_str = crypt('webdesigntutorialz','$5$rounds=1000$salttest$');
   $usr_str   = crypt('helloworld','$5$rounds=1000$salttest$');
   $res = hash_equals($known_str, $usr_str); 
   var_dump($res);
?>

Output

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

bool(false)

Example3

Comparing hash from hash() and hash_file() -

<?php
   $hash1 = hash("md5", 'Welcome to Webdesigntutorialz');
   file_put_contents('filetest.txt', 'Welcome to Webdesigntutorialz'); 
   // create file filetest.txt with content : 'Welcome to Webdesigntutorialz'
   $hash2 = hash_file('md5', 'filetest.txt');
   $_compare = hash_equals($hash1, $hash2); 
   var_dump($_compare);
?>

Output

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

bool(false)

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_file() Function.

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