如何在 PHP 中使用 MySQL 查詢結果填入下拉方塊？

Populating Dropdown Boxes with MySQL Query Results in PHP

In PHP, you can easily populate dropdown boxes with data retrieved from a MySQL database. While you may have attempted to do this before, it's essential to understand each line of code to ensure successful implementation.

To achieve this, first ensure that your MySQL credentials are correct, especially if you're using a test environment. Here's an example that demonstrates the process:

1. Database Connection:

mysql_connect('hostname', 'username', 'password');
mysql_select_db('database-name');

2. Query Execution:

$sql = "SELECT PcID FROM PC";
$result = mysql_query($sql);

3. Dropdown Box Creation:

echo "<select name='PcID'>";

4. Populating Options:

Iterate through the query results to create tags:

while ($row = mysql_fetch_array($result)) {
    echo "<option value='" . $row['PcID'] . "'>" . $row['PcID'] . "</option>";
}

5. Dropdown Box Closure:

echo "</select>";

This code will generate a dropdown box with options corresponding to the PcID values retrieved from the MySQL PC table.

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