How to generate dynamic selectbox with optgroup

Question

Hi I am having this mysql table.

CREATE TABLE IF NOT EXISTS `selling_counties` (
  `county_id` int(11) NOT NULL auto_increment,
  `country` varchar(20) collate u         


        

Answer 1

You need to select the values from your table

$mysqli = new mysqli($host, $user, $passwd, $database);
$result = $mysqli->query('select county_id, country, county_name from selling_counties');
$countries = array();
while ($row = $result->fetch_assoc()) {
    $country = $row['country'];
    if (!array_key_exists($country, $countries))
        $countries[$country] = array();

    $countries[$country][] = array($row['county_id'], $row['county']);
}

and put these in your html select.

Update to add county_id in <option>:

<option value="<?php echo htmlentities($county[0]); ?>"><?php echo htmlentities($county[1]); ?></option>

Answer 2

Create a new array like this, with countries as the keys, and the array of counties as each value. Assuming $rows is the array of raw table rows.

<?php

$countries = array();

foreach($rows as $row)
{
    if(isset($countries[$row['country']])) // <-- edit, was missing a ]
    {
        $contries[$row['country']][] = $row['county_name'];
    }
    else
    {
        $countries[$row['country']] = array($row['county_name']);
    }
}

?>

<select name ="county">
    <?php foreach($countries as $country => $counties): ?>

        <optgroup label="<?php echo htmlentities($country); ?>">

            <?php foreach($counties as $county): ?>

                <option><?php echo htmlentities($county); ?></option>

            <?php endforeach; ?>

        </optgroup>

    <?php endforeach; ?>
</select>