Phones Complete class

<?php

//declaring class instance
include("./mobile.class.php");
$mob = new mobile_phones();


if(isset($_POST['search']))
{
    //excluding post search data from request url
    $ex[0] = 'search';
    
    //creating search url from array of parameters
    $url = $mob->make_url($_POST, $ex);
    //performing search based on created url
    $phones = $mob->search($url);
    //outputing result
    echo "<pre>";
    print_r($phones);
    echo "</pre>";
}
//selecting all phone related parameters
$arr = $mob->get_param_list("bluetooth");
//simple userinterface form
echo "<form action='' method='post'>";
echo "<table>";
foreach($arr as $key => $val)
{
    echo "<tr>";
    //create select input for bluetooth
    if($val == "bluetooth")
    {
        echo "<td>".$val."</td><td><select name='".$val."'>";
        echo "<option value=''></option>";
        //selecting all possible values for bluetooth parameter
        $btvals= $mob->get_all_values($val);
        //outputting values
        foreach($btvals as $bt)
        {
            echo "<option value='".$bt."'>".$bt."</option>";
        }
        echo "</select></td>";
    }
    //else creating simple text boxes
    else
    {
        echo "<td>".$val."</td><td><input type='text' name='".$val."' ";
        if(isset($_POST[$val]))
        {
            echo "value='".$_POST[$val]."'";
        }
        echo "/></td>";
    }
    echo "</tr>";
}
echo "<tr><td colspan='2' align='center'><input type='submit'";
echo " value='Search'/></td></tr>";
echo "</table>";
echo "<input type='hidden' name='search'/>";
echo "</form>";
    
?>