封装PHP的图片水印的类，供大家参考，具体内容如下
<?phpheader("Content-type:text/html;charset=utf8");$img = new Image();// $img->water("2a.jpg","logo.gif",0);class Image{ //路径 protected $path; //是否启用随机名字 protected $isRandName; //要保存的图像类型 protected $type; //通过构造方法队成员属性进行初始化 function __construct($path="./",$isRandName=true,$type="png"){ $this->path = $path; $this->isRandName = $isRandName; $this->type = $type; } //对外公开的水印方法 /** * @param char $image 原图 * @param char $water 水印图片 * @param char $postion 位置 * @param int $tmp 透明度 * @param char $prefix 前缀 */ function water($image,$water,$postion,$tmp=100,$prefix="water_"){ //判断这两个图片是否存在 if(!file_exists($image)||!file_exists($water)){ die("图片资源不存在"); } //得到原图和水印图片的宽高 $imageInfo = self::getImageInfo($image); $waterInfo = self::getImageInfo($water); //判断水印图片是否能贴上来 if (!$this->checkImage($imageInfo,$waterInfo)){ die("水印图片太大"); } //打开图片 $imageRes = self::openAnyImage($image); $waterRes = self::openAnyImage($water); //根据水印图片的位置计算水印图片的坐标 $pos = $this->getPosition($postion,$imageInfo,$waterInfo); //将水印图片贴过来 imagecopymerge($imageRes, $waterRes, $pos["x"], $pos["y"], 0, 0, $waterInfo["width"], $waterInfo["height"], $tmp); //得到要保存图片的文件名 $newName = $this->createNewName($image,$prefix); //得到保存图片的路径,也就是文件的全路径 $newPath = rtrim($this->path,"/")."/".$newName; //保存图片 $this->saveImage($imageRes,$newPath); //销毁资源 imagedestroy($imageRes); imagedestroy($waterRes); //返回路径 return $newPath; } //保存图像资源 protected function saveImage($imageRes,$newPath){ $func = "image".$this->type; //通过变量函数进行保存 $func($imageRes,$newPath); } //得到文件名函数 protected function createNewName($imagePath,$prefix){ if ($this->isRandName){ $name = $prefix.uniqid().".".$this->type; }else { $name = $prefix.pathinfo($imagePath)["filename"].".".$this->type; } return $name; } //根据位置计算水印图片的坐标 protected function getPosition($postion,$imageInfo,$waterInfo){ switch ($postion){ case 1: $x = 0; $y = 0; break; case 2: $x = ($imageInfo["width"]-$waterInfo["width"])/2; $y = 0; break; case 3: $x = $imageInfo["width"]- $waterInfo["width"]; $y = 0; break; case 4: $x = 0; $y = ($imageInfo["height"]-$waterInfo["height"])/2; break; case 5: $x = ($imageInfo["width"]-$waterInfo["width"])/2; $y = ($imageInfo["height"]-$waterInfo["height"])/2; break; case 6: $x = $imageInfo["width"]- $waterInfo["width"]; $y = ($imageInfo["height"]-$waterInfo["height"])/2; break; case 7: $x = 0; $y = $imageInfo["height"] - $waterInfo["height"]; break; case 8: $x = ($imageInfo["width"]-$waterInfo["width"])/2; $y = $imageInfo["height"] - $waterInfo["height"]; break; case 9: $x = $imageInfo["width"]- $waterInfo["width"]; $y = $imageInfo["height"] - $waterInfo["height"]; break; case 0: $x = mt_rand(0, $imageInfo["width"]- $waterInfo["width"]); $y = mt_rand(0, $imageInfo["height"] - $waterInfo["height"]); break; } return ["x"=>$x , "y"=>$y]; } protected function checkImage($imageInfo,$waterInfo){ if (($waterInfo["width"] > $imageInfo["width"])||($waterInfo["height"] > $imageInfo["height"])){ return false; } return true; } //静态方法。根据图片的路径得到图片的信息，宽度，高度、mime类型 static function getImageInfo($imagePath){ $info = getimagesize($imagePath); $data["width"]=$info[0]; $data["height"]=$info[1]; $data["mime"] = $info["mime"]; return $data; } static function openAnyImage($imagePath){ //得到图像的mime类型 $mime = self::getImageInfo($imagePath)["mime"]; //根据不同的mime类型打开不同的图像 switch ($mime){ case "image/png": $image = imagecreatefrompng($imagePath); break; case "image/gif": $image = imagecreatefromgif($imagePath); break; case "image/jpeg": $image = imagecreatefromjpeg($imagePath); break; case "image/wbmp": $image = imagecreatefromwbmp($imagePath); break; } return $image; } }以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持网页设计。
