PHP | hash_equals() Function
January 11, 2021
Hello dear readers! welcome back to another edition of our tutorial on PHP. In this tutorial guide, we are going to be discussing about the PHP hash_equals() Function.
The built-in PHP hash_equals() function compares two strings at the same time and returns true if equal.
The built-in 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
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 built-in function works from PHP version greater than 5.6.0.
Example1
The following below is an example which demonstrates 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 PHP 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)
Alright guys! This is where we are rounding up for this tutorial post. In our next tutorial, we will discuss about the hash_file() Function in PHP.
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