Get all options from select via POST - php

Question

I am building a page in which I have 2 select boxes. I add items to Select #2 from Select #1.
When the submit button is clicked, I want to get all options only from Select #2 whether they are selected or not.
<?php
require('handlers/handler.php');
$active = $_POST['activeProperties'];
$slider = $_POST['sliderProperties'];
$array = array();
if(isset($_POST['submit'])){
if(isset($_POST['sliderProperties'])){
foreach($_POST['sliderProperties'] as $item){
$array[] = $item;
}
}
echo "<pre>";
print_r($array);
echo "</pre>";
}
?>
<form method="post" style="height: 600px;">
<select id="source" name="activeProperties[]" data-text="Source list" data-search="Search for options" style="height: 600px;">
<?php
$query = $handler11->query("SELECT ID, name FROM properties WHERE active = 'yes' ");
while($row = $query->fetch()){
echo '<option value="'.$row['ID'].'">'.$row['name'].'</option>';
}
?>
</select>
<select id="destination" name="sliderProperties[]" data-text="Destination list" data-search="Search for options">
</select>
<input type="submit" name="submit" class="btn btn-primary" value="Save"/>
</form>
I am only getting the first item in the select box with this code. How can I get all items?

Answer 1

You can use the multiple select of HTML (documentation here), try this:
<form method="post" style="height: 600px;">
<select multiple id="source" name="activeProperties[]" data-text="Source list" data-search="Search for options" style="height: 600px;">
<?php
$query = $handler11->query("SELECT ID, name FROM properties WHERE active = 'yes' ");
while($row = $query->fetch()){
echo '<option value="'.$row['ID'].'">'.$row['name'].'</option>';
}
?>
</select>
</form>
the other option is doing through Javascript.

Answer 2

If you want all the data if selected or not, cant you get the same result in your php by this query :
$query = $handler11->query("SELECT ID, name FROM properties WHERE active = 'yes' ");