Why Does My PHP Code Get 'Access Denied' When Connecting to MySQL, and How Can I Fix It?

Connecting to MySQL Database Failure from PHP: Resolving "Access Denied" Issue

Attempting to interact with a MySQL database from PHP can sometimes result in an "Access denied" error. In this instance, the specific error received is "Connect failed: Access denied for user 'root'@'localhost' (using password: YES)." Despite having access to the database through the command line and using the correct password, the webpage fails to connect.

To resolve this issue, the following steps were taken:

1. Log in to MySQL as the root user using:

   mysql -u root -p -h localhost

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2. Create a new user with the desired credentials:

   CREATE USER 'new_user'@'localhost' IDENTIFIED BY 'new_password';

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3. Create the database to be used:

   CREATE DATABASE database_name;

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4. Grant privileges to the new user for the database:

   GRANT ALL PRIVILEGES ON database_name.* TO 'new_user'@'localhost';

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5. Log out of the root account and log in as the new user:

   quit;
   mysql -u new_user -p -h localhost

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6. Import the database schema and data using a script:

   source database_schema.sql;

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After these changes were implemented, the PHP script successfully connected to the MySQL database using the following call:

$conn = new mysqli("localhost", "new_user", "new_password", "database_name");

By following these steps, the "Access denied" error was resolved, allowing the PHP function to interact with the MySQL database.

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