封装PHP的图片水印的类，供大家参考，具体内容如下
<?php header('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,'https://www.jb51.net/').'https://www.jb51.net/'.$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; } }