How to solve mysql error: Access denied for user 'root'@'localhost'

I have this simple php script:

<?php
$c = new mysqli("localhost", 'root', '');
echo($c->connect_error);
?>

My mysql credentials are correct but when I run the php script, it prints this error: Access denied for user 'root'@'localhost'. I started mysql and apache services using service mysql start and service apache2 start. When I type mysql -u root -h localhost on terminal, all goes well but not my script. I tried using laravel but still getting the same error. What am I doing wrong? Please help. Regards

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