Download an image from a given URL and create a thumbnail.

Download_Images.php

<?php

class Download_Images {
	
	var $source;
	var $save_to;
	var $set_extension;
	var $quality;

	function download($method = 'curl')
	{
	  $info = @GetImageSize($this->source);
	  $mime = $info['mime'];

	  $type = substr(strrchr($mime, '/'), 1);

	  switch ($type)
	{
	case 'jpeg':
	    $image_create_func = 'ImageCreateFromJPEG';
	    $image_save_func   = 'ImageJPEG';
		 $new_image_ext    = 'jpg';
		 $quality          = isSet($this->quality) ? $this->quality : 100;
	    break;

	case 'png':
	    $image_create_func = 'ImageCreateFromPNG';
	    $image_save_func   = 'ImagePNG';
		$new_image_ext     = 'png';

		$quality = isSet($this->quality) ? $this->quality : 0;
	    break;

	case 'bmp':
	    $image_create_func = 'ImageCreateFromBMP';
	    $image_save_func   = 'ImageBMP';
		$new_image_ext     = 'bmp';
	    break;

	case 'gif':
	    $image_create_func = 'ImageCreateFromGIF';
	    $image_save_func   = 'ImageGIF';
		$new_image_ext     = 'gif';
	    break;

	case 'vnd.wap.wbmp':
	    $image_create_func = 'ImageCreateFromWBMP';
	    $image_save_func   = 'ImageWBMP';
		$new_image_ext     = 'bmp';
	    break;

	case 'xbm':
	    $image_create_func = 'ImageCreateFromXBM';
	    $image_save_func   = 'ImageXBM';
		$new_image_ext     = 'xbm';
	    break;

	default:
		  $image_create_func = 'ImageCreateFromJPEG';
	      $image_save_func   = 'ImageJPEG';
		  $new_image_ext     = 'jpg';
	}

	if(isSet($this->set_extension))
	{
		$ext 	= strrchr($this->source, ".");
		$strlen = strlen($ext);
		if($this->set_name){
			$new_name = $this->set_name.'.'.$new_image_ext;
		}else{
			$new_name = basename(substr($this->source, 0, -$strlen)).'_'.time().'.'.$new_image_ext;
		}		
	}
	else
	{
		$new_name = basename($this->source);
	}

	$save_to = $this->save_to.$new_name;

	if($method == 'curl')
		  {
	      $save_image = $this->LoadImageCURL($save_to);
		  }
		  elseif($method == 'gd')
		  {
		  $img = $image_create_func($this->source);

		    if(isSet($quality))
		    {
			   $save_image = $image_save_func($img, $save_to, $quality);
			}
			else
			{
			   $save_image = $image_save_func($img, $save_to);
			}
		}
		
		$this->create_thumbnail($new_name,$this->save_to,$this->save_to,550);

		return array("name" => $new_name, "save" => $save_image);
	}

	function LoadImageCURL($save_to)
	{
		$ch = curl_init($this->source);
		$fp = fopen($save_to, "wb");

		$options = array(
                     CURLOPT_FILE => $fp,
		                 CURLOPT_HEADER => 0,
		                 CURLOPT_FOLLOWLOCATION => 1,
			               CURLOPT_TIMEOUT => 60
                );

		curl_setopt_array($ch, $options);

		curl_exec($ch);
		curl_close($ch);
		fclose($fp);
	}
	
	function create_thumbnail($fname,$pathToImages,$pathToThumbs, $thumbWidth)
	{
		$info = pathinfo($pathToImages . $fname);
		
		list($width, $height, $type, $attr)  = getimagesize($pathToImages . $fname);
	
		$file_type = strtolower($file_dimensions['mime']);

			if ( strtolower($info['extension']) == 'jpg' || strtolower($info['extension']) == 'jpeg' || strtolower($info['extension']) == 'png' || strtolower($info['extension']) == 'gif' )
			{			  
				  if (strtolower($info['extension']) == 'jpg' || strtolower($info['extension']) == 'jpeg'){
					  $img = imagecreatefromjpeg( "{$pathToImages}{$fname}" );
				  }elseif (strtolower($info['extension']) == 'png'){
					  $img = imagecreatefrompng( "{$pathToImages}{$fname}" );
					  $convert = 1;
				  }elseif(strtolower($info['extension']) == 'gif'){
					  $img = imagecreatefromgif( "{$pathToImages}{$fname}" );
				  }else{
					  $img = imagecreatefromstring( "{$pathToImages}{$fname}" );
				  }
				  
				  $width      = imagesx( $img );
				  $height     = imagesy( $img );							  
				  $new_width  = $thumbWidth;
				  $new_height = floor( $height * ( $thumbWidth / $width ) );
					
				  $tmp_img = imagecreatetruecolor( $new_width, $new_height );

				  if ($convert == 1) {

					imagealphablending($tmp_img, false);
					imagesavealpha($tmp_img,true);
					$transparent = imagecolorallocatealpha($tmp_img, 255, 255, 255, 127);
					imagefilledrectangle($tmp_img, 0, 0, $new_width, $new_height, $transparent);
					imagecopyresampled( $tmp_img, $img, 0, 0, 0, 0, $new_width, $new_height, $width, $height );
					imagepng( $tmp_img, "{$pathToThumbs}{$fname}");

				  } else {

					imagecopyresampled( $tmp_img, $img, 0, 0, 0, 0, $new_width, $new_height, $width, $height );
					imagejpeg( $tmp_img, "{$pathToThumbs}{$fname}", 100 );

					}

			}
	  }
}