How can PHP handle MySQL queries for dynamic dropdown population without requiring a page reload?

To handle MySQL queries for dynamic dropdown population without requiring a page reload, you can use AJAX in combination with PHP. When a user interacts with the dropdown menu, an AJAX request can be sent to a PHP script that queries the database and returns the data without reloading the page. 

<?php
// PHP code to handle AJAX request for dynamic dropdown population

// Check if the request is an AJAX request
if(isset($_GET['dropdown_value'])) {
    // Connect to the database
    $conn = new mysqli('localhost', 'username', 'password', 'database');

    // Get the value selected in the dropdown
    $dropdown_value = $_GET['dropdown_value'];

    // Query the database based on the selected value
    $query = "SELECT * FROM table WHERE column = '$dropdown_value'";
    $result = $conn->query($query);

    // Return the results as JSON
    $data = array();
    while($row = $result->fetch_assoc()) {
        $data[] = $row;
    }
    echo json_encode($data);

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

Keywords

PHP MySQL queries dynamic dropdown AJAX page reload

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