thinkPHP框架实现图像裁剪、缩放、加水印的方法

/*** 图像的裁剪、缩放、加水印* @param string $path    路径* @param int $width   裁剪的宽度/限制的高度或宽度，当有$height值时此值为图片的宽度，否则为限制的宽度或高度* @param int $height   [可选]裁剪的高度* @param boolean $water   [可选]是否加水印* @param int $word    [可选]水印文字*/function zoom_image($path,$width = 300,$height = null,$water = null,$word = 'water'){  $image = new /Think/Image();  $image->open($path);  $imgWidth = $image->width();  $imgHeight = $image->height();  // 限制尺寸  if($width and !$height){    $maxSize = $width;    // 宽度或高度大于规定尺寸时    if($imgWidth > $maxSize or $imgHeight > $maxSize){      $size = image_min_width($imgWidth,$imgHeight,$maxSize);      $image->thumb($size['width'], $size['height']);      $do = true;      $dowater = true;    }  // 裁剪固定尺寸  }else if($width and $height){    $size = image_min_width($imgWidth,$imgHeight,$width);    $image->thumb($size['width'], $size['height'])->crop($width, $height);    $do = true;    $dowater = true;  }  if($dowater and $water and $word){    $image->text($word,'./Public/images/arial.ttf',20,'#dddddd', /Think/Image::IMAGE_WATER_SOUTHEAST,-10);  }  // 未操作则不保存  if($do){    $image->save($path);  }}