PHP图片水印类的封装

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=

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,'/').'/'.$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脚本之家。

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