PHP图像操作：3D图、缩放、旋转、裁剪、添加水印（三）

发表时间：2015-05-27来源：网络

来源：http://www.ido321.com/887.html

5、PHP对图像的旋转

   1: 
   2:     旋转之前
   3:     
   4:

   5:    6: header("content-type","text/html;charset=utf-8");
   7:  
   8: /*
   9: *图片沿y轴旋转,以png格式为例
  10: *@param string $filename 图片的url
  11: */
  12: function turn_y($filename)
  13: {
  14:     /*创建图片资源*/
  15:     $backy = imagecreatefrompng($filename);
  16:  
  17:     /*获取大小*/
  18:     $widthy = imagesx($backy);
  19:     $heighty = imagesy($backy);
  20:  
  21:     /*创建新的图片资源，保存翻转后的图片*/
  22:     $newy = imagecreatetruecolor($widthy, $heighty);
  23:  
  24:     /*沿着y轴翻转，就是将原图从右向左按一个像素宽度向新资源中逐个复制*/
  25:     for ($i=0; $i   26:         imagecopy($newy,$backy,$widthy-$i-1,0,$i,0,1,$heighty);
  27:     }
  28:  
  29:     /*保存翻转后的图片*/
  30:     imagepng($newy,'http://www.zhishiwu.com/uploadfile/2014/1003/20141003110716679.png');
  31:  
  32:     /*释放资源*/
  33:     imagedestroy($backy);
  34:     imagedestroy($newy);
  35: }
  36:  
  37: /*
  38: *图片沿x轴旋转,以png格式为例
  39: *@param string $filename 图片的url
  40: */
  41: function turn_x($filename)
  42: {
  43:     /*创建图片资源*/
  44:     $backx = imagecreatefrompng($filename);
  45:  
  46:     /*获取大小*/
  47:     $widthx = imagesx($backx);
  48:     $heightx = imagesy($backx);
  49:  
  50:     /*创建新的图片资源，保存翻转后的图片*/
  51:     $newx = imagecreatetruecolor($widthx, $heightx);
  52:  
  53:     /*沿着x轴翻转，就是将原图从上到下按一个像素宽度向新资源中逐个复制*/
  54:     for ($i=0; $i   55:         imagecopy($newx,$backx,0,$heightx-$i-1,0,$i,$widthx,1);
  56:     }
  57:  
  58:     /*保存翻转后的图片*/
  59:     imagepng($newx,'http://www.zhishiwu.com/uploadfile/2014/1003/20141003110716424.png');
  60:  
  61:     /*释放资源*/
  62:     imagedestroy($backx);
  63:     imagedestroy($newx);
  64: }
  65: /*调用函数*/
  66: turn_y('http://www.zhishiwu.com/uploadfile/2014/1003/20141003110716574.png');
  67: turn_x('http://www.zhishiwu.com/uploadfile/2014/1003/20141003110716574.png');
  68: ?>
  69: 
  70:     沿着y轴旋转
  71:     
  72: 
  73: 
  74:     沿着x轴旋转
  75:     
  76: 
效果