What to do if php local installation mysql reports error 443

PHP is a programming language widely used in web development, while MySQL is a popular relational database management system. When performing local development, the combination of PHP and MySQL allows developers to efficiently develop websites with rich functional applications.

However, when installing PHP to connect to MySQL locally, you often encounter some problems. Among them, this article mainly discusses an error code 443 that may occur when PHP connects to local MySQL, and provides some solutions.

1. Error code 443

When PHP connects to the local MySQL database, you may encounter error code 443. In the specific implementation, the developer establishes a database connection through the PDO class, and code 443 will appear when connecting to the database, as shown below.

PDOException : SQLSTATE[HY000] [1045] Access denied for user '**'@'localhost' (using password: YES)

2. Reason for the error

1. MySQL username or password is incorrect

The MySQL database requires a username and password to connect. If an incorrect username or password occurs during the connection process, the connection will fail with code 443.

2. MySQL connection port error

The default connection port of MySQL is 3306, but if the default port is changed when installing MySQL, you need to make corresponding modifications in the code. Otherwise, error 443 will occur during the connection process.

3. The MySQL server does not start or runs with an error

If the MySQL server does not start or fails, a database connection to it cannot be established. Therefore, before connecting to local MySQL, you must ensure that the MySQL server is running properly.

3. Solutions

We can use the following solutions to address the above error causes.

1. Confirm MySQL username and password

First, you need to confirm whether the username and password used when connecting to MySQL are correct. You can try to log in to the MySQL server through the client tool that comes with MySQL to confirm whether the connection information is correct.

2. Confirm the correctness of the port

If the connection port is changed when installing MySQL, you need to make corresponding modifications in the PHP program. When providing a connection port when PDO connects to MySQL, the port number should be added.

$dsn = "mysql:host=localhost;port=3307;dbname=test";

3. Confirm the running status of the MySQL server

Before establishing a connection to the MySQL server, you need to ensure that the MySQL server is running normally. You can check whether the MySQL server can connect normally by executing the mysql -u root -p command on the command line.

If the MySQL server is determined to be running normally, you should check the configuration in the PHP environment. In particular, check in the PHP.ini file that mysqli.so and pdo_mysql.so are loaded. If not loaded, these extensions need to be enabled manually.

Through the above three solutions, you can usually solve the problem of error code 443 when connecting to local MySQL.

4. Summary

When developing locally, PHP and MySQL are often used to build web applications. However, error code 443 may appear when connecting to local MySQL, hindering the development process.

Aiming at this problem, this article analyzes the causes of error code 443 and provides corresponding solutions. Overall, we need to make sure the username and password are correct, the port number is correct, and the MySQL server is running properly.

By solving error code 443, we can happily program PHP and MySQL locally and implement better web applications.

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