一个PHP图片加水印, 生成缩略图类，觉得注释的挺清楚，与大家分享，如果想为你的PHP程序添加图片水印或者生成缩略图的话，应该是个不错的选择。
PHP生成缩略图加图片水印代码
<?PHP // 原始图片 $img1 = 'images/test.jpg'; // 水印后的图片 $img2 = 'images/test_new.jpg'; // 水印 $water = 'images/water.gif'; $img = new image(); // 等比缩放 $img->param($img1)->thumb('./image/test_0.jpg', 200,200,0); // center center 裁剪 $img->param($img1)->thumb('./image/test_1.jpg', 200,200,1); // top left 裁剪 $img->param($img1)->thumb('./image/test_2.jpg', 200,200,2); // 右下角添加水印 $img->param($img1)->water($img2,$water,9); class image { // 当前图片 protected $img; // 图像types 对应表 protected $types = array( 1 => 'gif', 2 => 'jpg', 3 => 'png', 6 => 'bmp' ); public function __construct($img=''){ !$img && $this->param($img); } public function param($img){ $this->img = $img; return $this; } public function getimageInfo($img){ $info = @getimagesize($img); if(isset($this->types[$info[2]])){ $info['ext'] = $info['type'] = $this->types[$info[2]]; } else{ $info['ext'] = $info['type'] = 'jpg'; } $info['type'] == 'jpg' && $info['type'] = 'jpeg'; $info['size'] = @filesize($img); return $info; } // thumb(新图地址, 宽, 高, 裁剪, 允许放大) public function thumb($filename,$new_w=160,$new_h=120,$cut=0,$big=0){ // 获取原图信息 $info = $this->getimageInfo($this->img); if(!empty($info[0])) { $old_w = $info[0]; $old_h = $info[1]; $type = $info['type']; $ext = $info['ext']; unset($info); // 如果原图比缩略图小 并且不允许放大 if($old_w < $new_h && $old_h < $new_w && !$big){ return false; } // 裁剪图片 if($cut == 0){ // 等比列 $scale = min($new_w/$old_w, $new_h/$old_h); // 计算缩放比例 $width = (int)($old_w*$scale); // 缩略图尺寸 $height = (int)($old_h*$scale); $start_w = $start_h = 0; $end_w = $old_w; $end_h = $old_h; } elseif($cut == 1){ // center center 裁剪 $scale1 = round($new_w/$new_h,2); $scale2 = round($old_w/$old_h,2); if($scale1 > $scale2){ $end_h = round($old_w/$scale1,2); $start_h = ($old_h-$end_h)/2; $start_w = 0; $end_w = $old_w; } else{ $end_w = round($old_h*$scale1,2); $start_w = ($old_w-$end_w)/2; $start_h = 0; $end_h = $old_h; } $width = $new_w; $height= $new_h; } elseif($cut == 2){ // left top 裁剪 $scale1 = round($new_w/$new_h,2); $scale2 = round($old_w/$old_h,2); if($scale1 > $scale2){ $end_h = round($old_w/$scale1,2); $end_w = $old_w; } else{ $end_w = round($old_h*$scale1,2); $end_h = $old_h; } $start_w = 0; $start_h = 0; $width = $new_w; $height= $new_h; } //载入原图 $createFun = 'ImageCreateFrom'.$type; $oldimg = $createFun($this->img); //创建缩略图 if($type!='gif' && function_exists('imagecreatetruecolor')){ $newimg = imagecreatetruecolor($width, $height); } else{ $newimg = imagecreate($width, $height); } // 复制图片 if(function_exists("ImagecopyResampled")){ ImagecopyResampled($newimg, $oldimg, 0, 0, $start_w, $start_h, $width, $height, $end_w,$end_h); } else{ ImagecopyResized($newimg, $oldimg, 0, 0, $start_w, $start_h, $width, $height, $end_w,$end_h); } // 对jpeg图形设置隔行扫描 $type == 'jpeg' && imageinterlace($newimg,1); // 生成图片 $imageFun = 'image'.$type; !@$imageFun($newimg,$filename) && die('保存失败!检查目录是否存在并且可写?'); ImageDestroy($newimg); ImageDestroy($oldimg); return $filename; } return false; } // water(保存地址,水印图片,水印位置,透明度) public function water($filename,$water,$pos=0,$pct=80){ // 加载水印图片 $info = $this->getimageInfo($water); if(!empty($info[0])){ $water_w = $info[0]; $water_h = $info[1]; $type = $info['type']; $fun = 'imagecreatefrom'.$type; $waterimg = $fun($water); } else{ return false; } // 加载背景图片 $info = $this->getimageInfo($this->img); if(!empty($info[0])){ $old_w = $info[0]; $old_h = $info[1]; $type = $info['type']; $fun = 'imagecreatefrom'.$type; $oldimg = $fun($this->img); } else{ return false; } // 剪切水印 $water_w >$old_w && $water_w = $old_w; $water_h >$old_h && $water_h = $old_h; // 水印位置 switch($pos){ case 0://随机 $posX = rand(0,($old_w - $water_w)); $posY = rand(0,($old_h - $water_h)); break; case 1://1为顶端居左 $posX = 0; $posY = 0; break; case 2://2为顶端居中 $posX = ($old_w - $water_w) / 2; $posY = 0; break; case 3://3为顶端居右 $posX = $old_w - $water_w; $posY = 0; break; case 4://4为中部居左 $posX = 0; $posY = ($old_h - $water_h) / 2; break; case 5://5为中部居中 $posX = ($old_w - $water_w) / 2; $posY = ($old_h - $water_h) / 2; break; case 6://6为中部居右 $posX = $old_w - $water_w; $posY = ($old_h - $water_h) / 2; break; case 7://7为底端居左 $posX = 0; $posY = $old_h - $water_h; break; case 8://8为底端居中 $posX = ($old_w - $water_w) / 2; $posY = $old_h - $water_h; break; case 9://9为底端居右 $posX = $old_w - $water_w; $posY = $old_h - $water_h; break; default: //随机 $posX = rand(0,($old_w - $water_w)); $posY = rand(0,($old_h - $water_h)); break; } // 设定图像的混色模式 imagealphablending($oldimg, true); // 添加水印 imagecopymerge($oldimg, $waterimg, $posX, $posY, 0, 0, $water_w,$water_h,$pct); $fun = 'image'.$type; !@$fun($oldimg, $filename) && die('保存失败!检查目录是否存在并且可写?'); imagedestroy($oldimg); imagedestroy($waterimg); return $filename; } } ?>
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