source: extensions/cuise/admin/classes/ImgLoad.php

<?php

if (!defined('PHPWG_ROOT_PATH')){
  die ("Hacking attempt!");
}


class AjaxImgupload{
        var $options = array(); 
        /* constructor */
        function __construct($options = array()){

                /* default configuration */ 

    $this->options = array( 'rootImg' => "/images/",
                'destDir'=>'/images/',
                'upload_url'=>'/images/',
    'file_support'=>array('jpeg', 'jpg', 'png', 'gif','bmp' ),
                'max_size'=>array(
                                'jpeg'=>'20111110',
        'jpg'=>'2011110',
        'gif'=>'2011110',
        'png'=>'2011110',
        'bmp'=>'2011110',
                                'txt'=>'500'
                                ),              
                'thumbnail_dir'=>'/images/',
                'thumbnail_url'=>'/images/',
                'thumbnail_dimension'=>array("max_width"=>200,"max_height"=>200)                                
                );

                /* replace with customi condiguration */
                $this->options = array_replace_recursive($this->options, $options);
        }
        /****** add file to repository *********/
        function addFile()      {
                /* validate uploaded file */
                $this->validate();              
        }
        /******************************
        *       validate file
        *        -  file size
        *        -  supported file type
        *        -  any kind of error in file upload
        *******************************/
        function validateFiles()        {
                $errorslist = array();
                $details = array();
                foreach($_FILES as $key=>$value){
                        //print $key;
                        $name = $value['name'];
                        $type = $value['type'];
                        $size = $value['size'];
                        
                        $extension = strtolower(substr(strstr($name,"."),1));

                        /* extension check */
                        if(!in_array($extension,$this->options['file_support']))                        {
                                $errorslist[$key][$name][] = "File is not of correct type";continue;
                        }      

                        /* Size of file check*/
      if ( isset($this->options['max_size'][$extension]) ){
        if(1024 * $this->options['max_size'][$extension] < $size)       {
                                    $errorslist[$key][$name][] = "File is too large".$size;
                                    continue;
                            } 
                        }else{
      $errorslist['error'] = $extension . " no max-size " . print_r($this->options['max_size'],true) ;
     
      }


                        /* mime type check */
                        if(!in_array($extension,$this->options['file_support']))                        {
                                $errorslist[$key][$name][] = "File is not of correct type";continue;
                        }
                        /* check for any kind of error in file upload */
                        if($value['error']!=0)                  {
                                $errorslist[$key][$name][] = "There was some error while uploading file. Please try again.";continue;   
                        }
                        /* generate unique name for file */
                           $filename = rand(10,10000)."_".date("Ymdh").".".$extension;
                        /* move file from temporary location to some location */                        
     
                        move_uploaded_file($value['tmp_name'], $this->options['destDir']."$filename");
      move_uploaded_file($value['tmp_name'], $this->options['destDir']."new.png");

                        if(isset($this->options['thumbnail_dir']))                      {
                                $this->createThumbnail($filename);      
                        }
                        
                        $details['files'][] = array(
      "name"=>$filename,
      "upload_name"=>$name,
      'thumbimgurl'=>$this->options['destDir'].$filename,
      'imgUrl'=>$this->options['destDir'].$filename,
      'action'=>'added',
      'errors'=> $errorslist
      
      );
                        

                }
                        
                if(isset($this->options['callback']))
                {
                        call_user_func($this->options['callback'],$details['files']);
                }
                return $details;
                
        }

        /******************************************************
        *this function generate thumbnail for uploaded images
        *******************************************************/
        function createThumbnail($file_name)    {
                $dimension = $this->options['thumbnail_dimension'];
                $file_path = $this->options['destDir'].$file_name;
                $new_file_path = $this->options['thumbnail_dir'].$file_name;
                list($img_width, $img_height) = @getimagesize($file_path);
                
                if (!$img_width || !$img_height) {
                    return false;
                }
                $scale = min(
                    $dimension['max_width'] / $img_width,
                    $dimension['max_height'] / $img_height
                );
                
                if ($scale >= 1) {
                    if ($file_path !== $new_file_path) {
                        return copy($file_path, $new_file_path);
                    }
                    return true;
                }
                
                $new_width = $img_width * $scale;
                $new_height = $img_height * $scale;
                $new_img = @imagecreatetruecolor($new_width, $new_height);
                
                switch (strtolower(substr(strrchr($file_name, '.'), 1))) {
                    case 'jpg':
                    case 'jpeg':
                                        
                        $src_img = @imagecreatefromjpeg($file_path);
                        $write_image = 'imagejpeg';
                        $image_quality = 75;
                        break;
                    case 'gif':
                        @imagecolortransparent($new_img, @imagecolorallocate($new_img, 0, 0, 0));
                        $src_img = @imagecreatefromgif($file_path);
                        $write_image = 'imagegif';
                        $image_quality = null;
                        break;
                    case 'png':
                        @imagecolortransparent($new_img, @imagecolorallocate($new_img, 0, 0, 0));
                        @imagealphablending($new_img, false);
                        @imagesavealpha($new_img, true);
                        $src_img = @imagecreatefrompng($file_path);
                        $write_image = 'imagepng';
                        $image_quality = 9;
                        break;
                    default:
                        $src_img = null;
                }
                $success = $src_img && @imagecopyresampled(
                    $new_img,
                    $src_img,
                    0, 0, 0, 0,
                    $new_width,
                    $new_height,
                    $img_width,
                    $img_height
                ) && $write_image($new_img, $new_file_path, $image_quality);
        
                // Free up memory (imagedestroy does not delete files):
                @imagedestroy($src_img);
                @imagedestroy($new_img);
                return $success;
        }
        
        /* Remove file from disk and call user function to clean related to file from database */
        function removeFile($names=array())     {
                $details = array();
                foreach($names as $name){
                        $status = array("name"=>$name,'action'=>'deleted');
                        $status['status'] = $this->unlinkImages($name);
                        $details['files'][] = $status;  
                }
                if(isset($this->options['callback']))           {
                                call_user_func($this->options['callback'],$details['files']);
                }
                return true;    
        }

        /* File delete */
        function unlinkImages($name)    {
                if(file_exists($this->options['destDir'].$name))
                {
                        @unlink($this->options['destDir'].$name);
                        @unlink($this->options['thumbnail_dir'].$name);
                        return true;    
                }
                else
                        return false;
        }

        /* Return all file */   
        function getFilesDetails()      {        
                $files = array();
                if(isset($this->options['loadcallback']))
                $files = call_user_func($this->options['loadcallback'],$this);
                return $files;
        }

        /* get thumbnail url */
        function getFile($id,$thumb=true)       {
                return $this->options['thumbnail_url'].$id;
        }       

        /* 
                interaction related to common functionality
                - addimg  upload image to repository
                - getfilethumb get file thumbnail as when required
                - deleteimg delete image from server
                - retrive all image details located on server

        */
        function responder($action=''){                 
                switch($action)
                {
                        case "addimg":
                                $details = $this->validateFiles();
                                print "<html><body>";
                                print(json_encode($details));
                                print "</body></html>";
                                break;
                        case "getfilethumb":
                                print $this->getFile($_REQUEST['action'],$name);
                                break;
                        case "deleteimg":
                                $filenames = explode(",",$_REQUEST['name']);
                                print $this->removeFile($filenames);
                                break;
                        case "getimages":
                                $details = $this->getFilesDetails();
                                print "<html><body>";
                                print(json_encode($details));
                                print "</body></html>";
                                break;
                }

        }

}
?>