echo background-image inline style not showing

why is echoing background-image url does not work? I'm trying to make each div with the same class have different background image

<?php
echo "<div class='paket_title' style='background-image :url("img1.jpg"); '>$r[head]</div>";
 ?>

here is the list of codes I've tried after searching for solutions :

echo "<div class='paket_title' style='background-image :url("img1.jpg"); '>$r[head]</div>";

echo "<div class='paket_title' style='background-image :url('img1.jpg');'>$r[head]</div>";

echo "<div class='paket_title' style='background-image :url("img1.jpg");'>$r[head]</div>";

echo '<div class="paket_title" style="background-image:url("img1.jpg");">$r[head]</div>';

echo '<div class="paket_title" style="background-image:url('img1.jpg');">$r[head]</div>';

echo '<div class="paket_title" style="background-image:url('img1.jpg');">$r[head]</div>';

echo '<div class="paket_title" style="background-image:url('img1.jpg');">$r[head]</div>';

echo "<div class='paket_title' style='background-image:url('img1.jpg');'>$r[head]</div>";

echo "<div class='paket_title' style='background-image:url("img1.jpg");'>$r[head]</div>";

echo '<div class="paket_title" style="background-image:url(img1.jpg);">$r[head]</div>';

echo "<div class='paket_title' style='background-image:url(img1.jpg);'>$r[head]</div>";

none of the above code is showing the image. I put the image in the same directory with this php file, even copy pasted the image to every subdirectory of my website folder.

here is the full code for this :

<?php
 if ($_GET['module']=='paketusaha'){
 $paket = mysql_query("SELECT * FROM paket_usaha ORDER BY id_paket DESC LIMIT 5");
  while ($r=mysql_fetch_array($paket)){
  $id_panel=1;
  $bg=$r['bgcolor'];
switch ($bg) {
  case "red" :
  echo "<div class='paket_title' style='background-image :url("img1.jpg"); '>$r[head]</div>";
  break;

  case "blue" :
  echo "<div class='paket_title' style='background-image :url("img2.jpg"); '>$r[head]</div>";
  break;

  case "yellow" :
  echo "<div class='paket_title' style='background-image :url("img2.jpg"); '>$r[head]</div>";
  break;


}


 echo "
 <img src='paket_usaha/$r[gambar]'></img>
  <div class='harga-pkt'>$r[judul]</div>
   <div id='container'>
    <div class='expandable-panel' id='cp-$id_panel'>
    <div class='expandable-panel-heading bold' style='background-color : $r[headcolor]; color : white;' >
        <h2>klik disini untuk info paket<span class='icon-close-open'></span></h2>
     </div>
    <div class='expandable-panel-content' >
        <p>$r[isi]</p>
    </div>
</div>

"; $id++;} ?>

everything is working fine except the background-image not showing, I even changed it to just background and still no luck