What role does SQL play in storing and retrieving data from a table filled by a PHP form?

SQL plays a crucial role in storing and retrieving data from a table filled by a PHP form. When a user submits a form, PHP processes the input data and then uses SQL queries to insert the data into a database table. To retrieve the data later, PHP again uses SQL queries to fetch the relevant information from the database table. 

// Assuming the form data is submitted via POST method
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Establish a connection to the database
    $conn = new mysqli("localhost", "username", "password", "database");

    // Check connection
    if ($conn->connect_error) {
        die("Connection failed: " . $conn->connect_error);
    }

    // Process form data
    $data1 = $_POST['data1'];
    $data2 = $_POST['data2'];

    // Prepare SQL query to insert data into a table
    $sql = "INSERT INTO table_name (column1, column2) VALUES ('$data1', '$data2')";

    // Execute the query
    if ($conn->query($sql) === TRUE) {
        echo "Data inserted successfully";
    } else {
        echo "Error: " . $sql . "<br>" . $conn->error;
    }

    // Close the database connection
    $conn->close();
}

Keywords

SQL data storage data retrieval PHP form table manipulation

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