Generating Picture Thumbnails in Virtual domains

During my Previous project, I got a situation where I have to generate thumbnail images in a virtual subdomain. Many thumbnail function we use will fail to work when it is used in virtual subdomains.
I didn't want to confuse you with my techie language. Let me explain with an eg:-
Consider a project of blogger, Where users can create their own user urls. Like litto.blogger.com, kevin.blogger.com. etc. Actually these subdomain urls are not created anywhere whereas it is redirected to a particular code or folder via htaccess. and it will continue executing from their. but the url remains the same. This is known as virtual url & virtual subdomain.
So when we want to display images in these domains we have to give absolute urls. Like Normally in php websites we give image url like ../upload/imagename.png. But Here we have to give url like http://sitename.com/upload/imagename.png.

So When we use normal thumbnail script for this images it will show error & will not generate. So In thsi situation what we can do is:-
1) During page reloading download the image to domain s local folder as thumbnails and show this images.

So here I tried it and I suceeded in it.
If you want it you can also gave it a try.


First step :- 1)Function to resize image & download it to local server
Name it as resize_image.php & include it in your server

<?php
/**
 * easy image resize function
 * @param  $file - file name to resize
 * @param  $width - new image width
 * @param  $height - new image height
 * @param  $proportional - keep image proportional, default is no
 * @param  $output - name of the new file (include path if needed)
 * @param  $delete_original - if true the original image will be deleted
 * @param  $use_linux_commands - if set to true will use "rm" to delete the image, if false will use PHP unlink
 * @param  $quality - enter 1-100 (100 is best quality) default is 100
 * @return boolean|resource
 */
  function smart_resize_image($file,
                              $width              = 0,
                              $height             = 0,
                              $proportional       = false,
                              $output             = 'file',
                              $delete_original    = true,
                              $use_linux_commands = false,
                                $quality = 100
           ) {
     
    if ( $height <= 0 && $width <= 0 ) return false;

    # Setting defaults and meta
    $info                         = getimagesize($file);
    $image                        = '';
    $final_width                  = 0;
    $final_height                 = 0;
    list($width_old, $height_old) = $info;
    $cropHeight = $cropWidth = 0;

    # Calculating proportionality
    if ($proportional) {
      if      ($width  == 0)  $factor = $height/$height_old;
      elseif  ($height == 0)  $factor = $width/$width_old;
      else                    $factor = min( $width / $width_old, $height / $height_old );

      $final_width  = round( $width_old * $factor );
      $final_height = round( $height_old * $factor );
    }
    else {
      $final_width = ( $width <= 0 ) ? $width_old : $width;
      $final_height = ( $height <= 0 ) ? $height_old : $height;
      $widthX = $width_old / $width;
      $heightX = $height_old / $height;
     
      $x = min($widthX, $heightX);
      $cropWidth = ($width_old - $width * $x) / 2;
      $cropHeight = ($height_old - $height * $x) / 2;
    }

    # Loading image to memory according to type
    switch ( $info[2] ) {
      case IMAGETYPE_JPEG:  $image = imagecreatefromjpeg($file);  break;
      case IMAGETYPE_GIF:   $image = imagecreatefromgif($file);   break;
      case IMAGETYPE_PNG:   $image = imagecreatefrompng($file);   break;
      default: return false;
    }
   
   
    # This is the resizing/resampling/transparency-preserving magic
    $image_resized = imagecreatetruecolor( $final_width, $final_height );
    if ( ($info[2] == IMAGETYPE_GIF) || ($info[2] == IMAGETYPE_PNG) ) {
      $transparency = imagecolortransparent($image);
      $palletsize = imagecolorstotal($image);

      if ($transparency >= 0 && $transparency < $palletsize) {
        $transparent_color  = imagecolorsforindex($image, $transparency);
        $transparency       = imagecolorallocate($image_resized, $transparent_color['red'], $transparent_color['green'], $transparent_color['blue']);
        imagefill($image_resized, 0, 0, $transparency);
        imagecolortransparent($image_resized, $transparency);
      }
      elseif ($info[2] == IMAGETYPE_PNG) {
        imagealphablending($image_resized, false);
        $color = imagecolorallocatealpha($image_resized, 0, 0, 0, 127);
        imagefill($image_resized, 0, 0, $color);
        imagesavealpha($image_resized, true);
      }
    }
    imagecopyresampled($image_resized, $image, 0, 0, $cropWidth, $cropHeight, $final_width, $final_height, $width_old - 2 * $cropWidth, $height_old - 2 * $cropHeight);
   
   
    # Taking care of original, if needed
    if ( $delete_original ) {
      if ( $use_linux_commands ) exec('rm '.$file);
      else @unlink($file);
    }

    # Preparing a method of providing result
    switch ( strtolower($output) ) {
      case 'browser':
        $mime = image_type_to_mime_type($info[2]);
        header("Content-type: $mime");
        $output = NULL;
      break;
      case 'file':
        $output = $file;
      break;
      case 'return':
        return $image_resized;
      break;
      default:
      break;
    }
   
    # Writing image according to type to the output destination and image quality
    switch ( $info[2] ) {
      case IMAGETYPE_GIF:   imagegif($image_resized, $output);    break;
      case IMAGETYPE_JPEG:  imagejpeg($image_resized, $output, $quality);   break;
      case IMAGETYPE_PNG:
        $quality = 9 - (int)((0.9*$quality)/10.0);
        imagepng($image_resized, $output, $quality);
        break;
      default: return false;
    }

    return true;
  }
?>

Step 2: Include it in your file:-

<?php include("resize_image.php");          ?>


Step 3: Loop the images in file


<?php
      while($rows=mysql_fetch_array($sql_p))
      {
$loc=$rows['photo_loc'];
$filenameIn  = "http://yoursite.com/upload/".$loc; // Give the images actual url
$filenameOut = __DIR__ . '/images/' .$loc; // Give here where image to be downloaded  your virtual domain folder
$out="http://yoursite.com/user/template/adv001/images/".$loc;// Full path of image in virtual domain
//$contentOrFalseOnFailure   = file_get_contents($filenameIn);
//$byteCountOrFalseOnFailure = file_put_contents($filenameOut, $contentOrFalseOnFailure);
$file = $filenameIn ;

//indicate the path and name for the new resized file
$resizedFile = $filenameOut;

//call the function
smart_resize_image($file , 150 , 150 , false , $resizedFile , false , false ,100 );
      ?>
                      <li>  <img src="http://<?php echo $server_name; ?>/user/template/adv001/images/<?php echo $rows['photo_loc'];?>" alt="" width="150px" height="150px">  </li>
              
<?php } ?>