Connecting PHP with MySQL

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By linking PHP to MySQL, your website will be able to open, retrieve, edit, and delete database data. This connection is used for most dynamics websites including login, registration forms, dashboards, and blogs.

Basically, PHP sends information back and forth between MySQL in order to store and retrieve data.

Why Connect PHP with MySQL

PHP by itself is not enough! It cannot store data over time. But when you combine it with MySQL, it can store data in tables, safely. When PHP and MySQL work hand in hand, your website will be stronger and more interactive.

Some common uses include:

To save user registration data
Checking the login information
Saving blog posts or comments
Products & Orders management

Therefore, most PHP applications use MySQL.

What You Need Before Connecting

Before connecting PHP with MySQL, make sure you have:

install PHP and its modules
MySQL database created
Database name
Username and password
A local server such as XAMPP or WAMP

When these are prepared you can go ahead with connection.

Ways to Connect PHP with MySQL

For this database, Php offers two options to connect to MySQL.

MySQLi (Improved MySQL)
PDO (PHP Data Objects)

MySQLi is easier to understand for beginners. Hence we are using in this tutorial.

Connecting PHP with MySQL Using MySQLi

PHP can be linked to MySQL using the mysqli_connect() function.

Example: Database Connection File

<?php
$servername = "localhost";
$username = "root";
$password = "";
$database = "test_db";

$conn = mysqli_connect($servername, $username, $password, $database);

if (!$conn) {
    die("Connection failed: " . mysqli_connect_error());
}

echo "Database connected successfully";
?>

Here, PHP is connected to MySql database.

Explanation of the Code

localhost is the server name
root is the default username
test_db is the database name
$conn contains the connection

“Error Message” is raised if the connection does not work, else “No Error” should be.

Using the Connection in Other Files

One good idea is to keep connection code out of the main page in a separate file.

So say, create a file called db.php.

Then include it as needed.

<?php
include "db.php";
?>

So your code will be cleaner and more organized.

Closing the Database Connection

Once you have finished working on a database, exit out.

<?php
mysqli_close($conn);
?>

This reduces workload and improves performance.

Common Errors Beginners Face

There is a lot of problem while connecting PHP and MySQL for beginners.

Incorrect database title
Invalid username or password
MySQL service not running
Forgetting to include the connection

Checking these fixes most problems quickly.

Best Practices for Database Connection

Follow these tips for better and safer code:

Store connection code in a single file
Never display database errors on the live website.
Use environment variables instead.
After you‘ve used the connection, close it…

These actions help to secure your project.

Summary

Having PHP in conjunction with MySQL makes it possible for your websites and applications to use data to enhance user experiences. With the MySQLi tool, even new users should be able to connect PHP to a database after which they will be able to develop a login feature, and a dashboard. After the connection is established, you can then go ahead and implement insert, select, update and delete.