PHP图像操作：3D图、缩放、旋转、裁剪、添加水印（三）

来源：https://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,'https://www.2cto.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,'https://www.2cto.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('https://www.2cto.com/uploadfile/2014/1003/20141003110716574.png');

  67: turn_x('https://www.2cto.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