How can I pass an HTML value to a PHP variable - php

Question

I have a simple web app made with CodeIgniter 3 and I have created a simple dropdown menu where the user can select from a variety of options from the database.
Here is the code:
<?php
$sql4 = "SELECT DISTINCT (color), id FROM porta_color ORDER BY color ASC ";
$result4 = $conn->query($sql4);
?>
<select id="color" class="form-control selectpicker" data-size="10" data-live-search="true" data-style="btn-white" name="k_color" required >
<?php
if ($result4->num_rows > 0)
{
while($row4 = $result4->fetch_assoc())
{
if($row4['id']>0)
{?>
<option value="<?=$row4['id'];?>"><?=$row4['color'];?></option>
<?php }}}?>
</select>
Now what I want to do is based on the selection from the user to pass the value to a PHP variable.
Any idea how I might do that?

Answer 1

Wrap your select into form tags
and add submit or button element
<form>
<select id="color" class="form-control selectpicker" data-size="10" data-live-search="true" data-style="btn-white" name="k_color" required >
<option value="color1">Color 1</option>
<option value="color2">Color 2</option>
<option value="color3">Color 3</option>
</select>
<input type="submit" values="Choose color">
<button>Another way for submit form</button>
</form>
But true way is using framework abilities