Como puxar dados de um banco de dados MySQL para uma folha de estilo em seu próprio arquivo/pasta?

<?php

    //$db = new PDO('mysql:host=localhist;dbname=cms', 'root', 'root');

    //$query = $db->query("SELECT * FROM `selector`");
    //$query = $query->fetchAll();

    $query = array(
        array('id' => 1, 'selector' => '.thisone'),
        array('id' => 2, 'selector' => '#thatone'),
        array('id' => 3, 'selector' => '.body')
    );

    $probs = array(
        1 => array(
            array('id' => 1, 'selector_id' => 1, 'css_element' => 'border', 'element_value' => '1px solid'),
            array('id' => 2, 'selector_id' => 1, 'css_element' => 'padding', 'element_value' => '10px')
        ),
        2 => array(
            array('id' => 1, 'selector_id' => 2, 'css_element' => 'border', 'element_value' => '1px solid')
        ),
        3 => array(
            array('id' => 1, 'selector_id' => 2, 'css_element' => 'width', 'element_value' => '40px'),
            array('id' => 2, 'selector_id' => 2, 'css_element' => 'height', 'element_value' => '40px')
        )
    );

    $css = '';
    foreach($query as $selector){
        //$properties = $db->query("SELECT * FROM `properties` WHERE `selector_id` = $selector->id");
        //$properties = $properties->fetchAll();

        $properties = $probs[$selector['id']];

        $rules = '';
        foreach($properties as $element){
            $rules .= "\n \t$element[css_element]:$element[element_value];";
        }

        $css .= "$selector[selector]".'{'."$rules \n".'}'."\n\n";
    }

    $fp = fopen('style.css',"w");
    fwrite($fp,$css);
    fclose($fp);

    echo "<pre>";
    echo "$css";
    echo "</pre>";

?>

.thisone{
    border:1px solid;
    padding:10px; 
}

#thatone{
    border:1px solid; 
}

.body{
    width:40px;
    height:40px; 
}