### Instruction:
Implement a PHP web page that allows users to enter a date range and then queries a MySQL database to retrieve records of sales transactions occurring within that date range. Display the results in a table format, sorted by transaction date.


### Response:

To implement this, you'll need to set up a PHP web page with an HTML form for users to enter the date range and then use PHP to query the MySQL database. Here's a step-by-step guide:

1. Create a new file called `index.php` and open it in your favorite text editor.

2. Add the following code to create an HTML form where users can input the start and end dates of the date range:

```html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Date Range Query</title>
</head>
<body>
    <h1>Enter Date Range</h1>
    <form action="results.php" method="post">
        <label for="start_date">Start Date:</label>
        <input type="date" id="start_date" name="start_date" required>
        <br><br>
        <label for="end_date">End Date:</label>
        <input type="date" id="end_date" name="end_date" required>
        <br><br>
        <button type="submit">Submit</button>
    </form>
</body>
</html>
```

3. Create another file called `results.php`. This file will handle the form submission and display the results from the MySQL query.

4. In `results.php`, add the following code to connect to your MySQL database. Replace the placeholders with your actual database credentials:

```php
<?php
$servername = "your_servername";
$username = "your_username";
$password = "your_password";
$dbname = "your_dbname";

$conn = new mysqli($servername, $username, $password, $dbname);

if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}
?>
```

5. Add the following code to `results.php` to retrieve the date range from the submitted form and query the MySQL database for sales transactions within that date range:

```php
<?php
$start_date = $_POST['start_date'];
$end_date = $_POST['end_date'];

$sql = "SELECT * FROM sales_transactions WHERE transaction_date BETWEEN '$start_date' AND '$end_date' ORDER BY transaction_date";
$result = $conn->query($sql);
?>
```

6. Finally, add the following code to `results.php` to display the results in a table format:

```php
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Results</title>
</head>
<body>
    <h1>Sales Transactions between <?php echo $start_date; ?> and <?php echo $end_date; ?></h1>
    <?php
    if ($result->num_rows > 0) {
        echo "<table border='1'>
                <tr>
                    <th>ID</th>
                    <th>Transaction Date</th>
                    <th>Amount</th>
                </tr>";
        while ($row = $result->fetch_assoc()) {
            echo "<tr>
                    <td>" . $row["id"] . "</td>
                    <td>" . $row["transaction_date"] . "</td>
                    <td>" . $row["amount"] . "</td>
                  </tr>";
        }
        echo "</table>";
    } else {
        echo "No results found.";
    }

    $conn->close();
    ?>
</body>
</html>
```

7. Save both files (`index.php` and `results.php`) and upload them to your web server. Make sure your MySQL database has a table called `sales_transactions` with columns `id`, `transaction_date`, and `amount`.

8. Open the `index.php` file in your browser, enter a date range, and click "Submit" to see the results.

This is a basic implementation of a PHP web page that allows users to enter a date range and then queries a MySQL database to retrieve records of sales transactions occurring within that date range. You can further customize this code as needed for your specific use case.