php圖片中寫入字符串然後生成圖片下載到本地

<?php

/**

 * 生成卡片得類

 * Enter description here ...

 * @author perry

 * @time   2014-03-03 10:02:20

 */

class CreateImg{

	public $destination;  //默認圖片

	public $fontname;     //默認的字體

	public $font_size;    //字體大小

	public $company  ;    //字符串

	public $booth;        //字符串

	public $im;           //圖片對象

	public $filedir;      //圖片零時目錄

	function CreateImg($destination,$company,$booth,$fontname='font/ADOBEGOTHICSTD-BOLD.OTF',$font_size='14'){

	   $this->destination = $destination;

	   $this->company=$company;

	   $this->booth = $booth;

	   $this->fontname = $fontname;

	   $this->font_size = $font_size;

	}

	/**

	 * 生成一個圖片

	 * Enter description here ...

	 * @param unknown_type $dir  圖片零時保存目錄

	 */

	function createNew($dir='attachment'){

		//Header('Content-type: image/jpg');

		$this->im = imagecreatefromjpeg($this->destination);

		$black = imagecolorallocate($this->im, 0, 160, 236); //字體顏色

		//文字放在圖片位置

		imagettftext($this->im, $this->font_size,0, 395, 410, $black, $this->fontname, $this->company);

        imagettftext($this->im, $this->font_size,0, 365, 437, $black, $this->fontname, $this->booth);

        //保存目录是否存在，否則創建一個

        if(!is_dir($dir)){

        	mkdir($dir);

        }

        $this->filename=date('YmdHis',time()).rand(10000,999999).".jpg";  //新文件名称

        $this->filedir=$dir."/".$this->filename;

        imagejpeg($this->im);

        imagedestroy($this->im);

	}

	/**

	 * 下載圖片到本地

	 * Enter description here ...

	 * @param unknown_type $ispre 是否保存在空間：1保存  0不保存

	 */

	function downNew($ispre=0){

		Header("Content-type: application/octet-stream");

		Header("Accept-Ranges: bytes");

		Header("Accept-Length: ".filesize($this->filedir));

		Header("Content-Disposition: attachment; filename=e-invitation.jpg");

		$fh = fopen($this->filedir, 'rb');

		fpassthru($fh);

		fclose($fh);

		empty($ispre)? unlink($this->filedir):null;

		exit();

	}

}