What are the recommended steps for connecting to a MySQL database and executing queries in PHP?

To connect to a MySQL database and execute queries in PHP, you need to first establish a connection to the database using the mysqli_connect() function. After connecting, you can use mysqli_query() to execute SQL queries on the database. Make sure to handle any errors that may occur during the connection or query execution. 

// Step 1: Establish a connection to the MySQL database
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database_name";

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

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

// Step 2: Execute a query on the database
$sql = "SELECT * FROM table_name";
$result = mysqli_query($conn, $sql);

if (mysqli_num_rows($result) > 0) {
    // Output data of each row
    while($row = mysqli_fetch_assoc($result)) {
        echo "id: " . $row["id"]. " - Name: " . $row["name"]. "<br>";
    }
} else {
    echo "0 results";
}

// Step 3: Close the connection
mysqli_close($conn);

Keywords

MySQL PHP database connection query execution SQL injection

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