Sorting Using PHP - php

Question

I am a php novice so please be kind.... Need to sort date, after location has been selected.
<div id="enroll_now">
<form name="enroll" id="enroll" method="post" action="<?php echo get_permalink(762); ?>">
<p>
<label >Class Title</label>
<input type="text" name="class_title" value="<?php echo $title;?>">
</input>
</p>
<p>
<label>Choose Location</label>
<select name="location" id="location" >
<option selected="selected" value="0">--Select Location--</option>
<?php
$result = mysql_query("SELECT * from wp_location WHERE class_id=$page_id ORDER BY location ASC");
while($row = mysql_fetch_array($result))
{
echo "<option value=".$row['id'].">".$row['location']."</option>";
}
?>
</select>
</p>
<p>
<label>Choose Date</label>
<select name="choose_date" id="choose_date">
<?php
if (isset($datesavailable) && is_array($datesavailable)) {
foreach($datesavailable as $val)
{
echo' <option value="'.$val.'">'.$val.'</option>\n';
}
}
?>
</select>
</p>
<p>
<input type="image" src="<?php bloginfo('template_url'); ?>/images/confirm.png" alt="Confirm Information" />
</p>
</form>
</div>
The locations sorts fine, but then when I get to the date, I need them to sort by closest date first. Any help would be appricated. Thanks.

Answer 1

Use ORDER BY somecolumn in your query; http://dev.mysql.com/doc/refman/5.0/en/order-by-optimization.html

Answer 2

If the dates are just an array, you can use asort or arsort.
http://php.net/manual/en/function.asort.php

Answer 3

I examined your page and see that you're sending a POST (id & location) when the event change is triggered in your combo. My suggestion is to query the database like this
SELECT * from wp_location WHERE class_id=$_POST['id'] AND location=$_POST['location'] ORDER BY date
I'm assuming date field in your database is DATE, DATETIME or TIMESTAMP type.