How can I diagnose an 'Access denied for user' error in PHP when connecting to MySQL?

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Grade: Education Subject: Support
How can I diagnose an 'Access denied for user' error in PHP when connecting to MySQL?
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This error usually means the username or password provided in your PHP connection string is incorrect, or the specified user doesn't have the necessary privileges to connect from the host your PHP script is running on. Double-check the username and password, and ensure the database user is allowed to connect from your web server's IP address or hostname within the database's user grant settings.