Remember Select Option - php

Question

I have this form:
<form method='POST' action='update_ads.php'>
<select size='1' name='type'>
<OPTION value=''></OPTION>
<OPTION value='1'>Open</OPTION>
<OPTION value='0'>Closed</OPTION>
</select>
<input type='submit' value='Save'>
</form>
and this PHP file associated with it:
$id = $_POST['id'];
$type = addslashes($_POST['type']);
$query = mysql_query("UPDATE ads SET type='$type' where id=$id");
What can I add so that the option that the user choose before they clicked "submit" comes back when they re-open it? Thanks!

Answer 1

You could do it this way:
<?php
if (isset($_POST['id']) && ((int) $_POST['id'])) != 0) {
$id = $_POST['id'];
}
//connect to db
//get the responce of the query "SELECT `type` FROM `ads` WHERE `id` = $id"
//put it in a variable named $type
?>
<form method="POST" action="">
<select size='1' name='type'>
<option value="" <?=($type == '') ? 'selected="selected"' : ''?>></option>
<option value="1" <?=($type == 1) ? 'selected="selected"' : ''?>>Open</option>
<option value="0" <?=($type == 2) ? 'selected="selected"' : ''?>>Closed</option>
</select>
</form>
Edit: This is good ony if you have a select with not many options, otherwise you should use somethink like a foreach statement.
For many options you can use this:
<?php
$options = array('Open' => 1, 'Closed' => 0, 'Select an option' => ''); ?>
<form method="POST" action="">
<select size='1' name='type'>
<?php
foreach($options as $label => $option) {
if ($type == $option) {
$checked = 'selected="selected"';
}
else {
$checked = '';
}
?>
<option value="<?=$option?>" <?=$checked?>><?=$label?></option>
<?php
}
?>
</select>
</form>

Answer 2

Put this form in a string ($form) and do this
$form = str_replace(" value='".$id."'>"," value='".$id."' selected>", $form);
echo $form;
You can memorize the $id in a cookie.

Answer 3

when the user loads the page, you have to check the database for the current selection.
then you change the html based on the selection:
<OPTION value='1' selected='selected'>Open</OPTION>
<OPTION value='0'>Closed</OPTION>
or
<OPTION value='1'>Open</OPTION>
<OPTION value='0' selected='selected'>Closed</OPTION>
by the way, your ID has not been set in this form. you need to escape that as well

Answer 4

Not really the best solution, but it don't really know where this is going.
<select size="1" name="type">
<option value=""></option>
<option value="1"<?= $_POST['type']==1 ? " selected" : ""?>></option>
<option value="0"<?= $_POST['type']==0 ? " selected" : ""?>></option>
</select>
BTW: You might want to take a look at this.