How to convert received binary data stream into image in php

<?php  
    class image {  
        const ROOT_PATH = &#39;./&#39;;  
        const FAIL_WRITE_DATA = &#39;Fail to write data&#39;;  
        //没有数据流  
        const NO_STREAM_DATA = &#39;The post data is empty&#39;;  
        //图片类型不正确  
        const NOT_CORRECT_TYPE = &#39;Not a correct image type&#39;;  
        //不能创建文件  
        const CAN_NOT_CREATE_FILE = &#39;Can not create file&#39;;  
        //上传图片名称  
        public $image_name;  
        //图片保存名称  
        public $save_name;  
        //图片保存路径  
        public $save_dir;  
        //目录+图片完整路径  
        public $save_fullpath;  
          
        /** 
         * 构造函数 
         * @param String $save_name 保存图片名称 
         * @param String $save_dir 保存路径名称 
         */  
        public function __construct($save_name, $save_dir) {  
            //set_error_handler ( $this->error_handler () );  
              
            //设置保存图片名称，若未设置，则随机产生一个唯一文件名  
            $this->save_name = $save_name ? $save_name : md5 ( mt_rand (), uniqid () );  
            //设置保存图片路径，若未设置，则使用年/月/日格式进行目录存储  
            $this->save_dir =  $save_dir ? self::ROOT_PATH .$save_dir : self::ROOT_PATH .date ( &#39;Y/m/d&#39; );  
               
            //创建文件夹  
            @$this->create_dir ( $this->save_dir );  
            //设置目录+图片完整路径  
            $this->save_fullpath = $this->save_dir . &#39;/&#39; . $this->save_name;  
        }  
        //兼容PHP4  
        public function image($save_name) {  
            $this->__construct ( $save_name );  
        }  
          
        public function stream2Image() {  
            //二进制数据流  
            $data = file_get_contents ( &#39;php://input&#39; ) ? file_get_contents ( &#39;php://input&#39; ) : gzuncompress ( $GLOBALS [&#39;HTTP_RAW_POST_DATA&#39;] );  
            //数据流不为空，则进行保存操作  
            if (! emptyempty ( $data )) {  
                //创建并写入数据流，然后保存文件  
                if (@$fp = fopen ( $this->save_fullpath, &#39;w+&#39; )) {  
                    fwrite ( $fp, $data );  
                    fclose ( $fp );  
                    $baseurl = "http://" . $_SERVER ["SERVER_NAME"] . ":" . $_SERVER ["SERVER_PORT"] . dirname ( $_SERVER ["SCRIPT_NAME"] ) . &#39;/&#39; . $this->save_name;                  
                    if ( $this->getimageInfo ( $baseurl )) {  
                        echo $baseurl;  
                    } else {  
                        echo ( self::NOT_CORRECT_TYPE  );  
                    }  
                } else {  
                  
                }  
            } else {  
                //没有接收到数据流  
                echo ( self::NO_STREAM_DATA );  
            }  
        }  
        /** 
         * 创建文件夹 
         * @param String $dirName 文件夹路径名 
         */  
        public function create_dir($dirName, $recursive = 1,$mode=0777) {  
            ! is_dir ( $dirName ) && mkdir ( $dirName,$mode,$recursive );  
        }  
        /** 
         * 获取图片信息，返回图片的宽、高、类型、大小、图片mine类型 
         * @param String $imageName 图片名称 
         */  
        public function getimageInfo($imageName = &#39;&#39;) {  
            $imageInfo = getimagesize ( $imageName );  
            if ($imageInfo !== false) {  
                $imageType = strtolower ( substr ( image_type_to_extension ( $imageInfo [2] ), 1 ) );  
                $imageSize = filesize ( $imageInfo );  
                return $info = array (&#39;width&#39; => $imageInfo [0], &#39;height&#39; => $imageInfo [1], &#39;type&#39; => $imageType, &#39;size&#39; => $imageSize, &#39;mine&#39; => $imageInfo [&#39;mine&#39;] );  
            } else {  
                //不是合法的图片  
                return false;  
            }  
          
        }  
          
        /*private function error_handler($a, $b) { 
            echo $a, $b; 
        }*/  
      
    }