Share PHP image watermark class

This article mainly introduces the encapsulation of PHP image watermark class in detail, which has certain reference value. Interested friends can refer to

Encapsulating PHP image watermark class for everyone. For reference, the specific content is as follows

<?php
header(&#39;Content-type:text/html;charset=utf8&#39;);
$img = new Image();
// $img->water(&#39;2a.jpg&#39;,&#39;logo.gif&#39;,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($path=&#39;./&#39;,$isRandName=true,$type=&#39;png&#39;){
    $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=&#39;water_&#39;){
    //判断这两个图片是否存在
    if(!file_exists($image)||!file_exists($water)){
      die(&#39;图片资源不存在&#39;);
    }
    //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(&#39;水印图片太大&#39;);
    }
    //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[&#39;x&#39;], $pos[&#39;y&#39;], 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,&#39;/&#39;).&#39;/&#39;.$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){
    $func = &#39;image&#39;.$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 = $prefix.uniqid().&#39;.&#39;.$this->type;
    }else {
      $name = $prefix.pathinfo($imagePath)[&#39;filename&#39;].&#39;.&#39;.$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[&#39;width&#39;]-$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[&#39;width&#39;]-$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[&#39;height&#39;] - $waterInfo["height"];
        break;
      case 8:
        $x = ($imageInfo[&#39;width&#39;]-$waterInfo["width"])/2;
        $y = $imageInfo[&#39;height&#39;] - $waterInfo["height"];
        break;
      case 9:
        $x = $imageInfo["width"]- $waterInfo["width"];
        $y = $imageInfo[&#39;height&#39;] - $waterInfo["height"];
        break;
      case 0:
        $x = mt_rand(0, $imageInfo["width"]- $waterInfo["width"]);
        $y = mt_rand(0, $imageInfo[&#39;height&#39;] - $waterInfo["height"]);
        break;
    }
    return [&#39;x&#39;=>$x , &#39;y&#39;=>$y];
  }
  protected function checkImage($imageInfo,$waterInfo){
    if (($waterInfo[&#39;width&#39;] > $imageInfo[&#39;width&#39;])||($waterInfo[&#39;height&#39;] > $imageInfo[&#39;height&#39;])){
      return false;
    }
    return true;
  }
  //静态方法。根据图片的路径得到图片的信息，宽度，高度、mime类型
  static function getImageInfo($imagePath){
    $info = getimagesize($imagePath);
    $data[&#39;width&#39;]=$info[0];
    $data[&#39;height&#39;]=$info[1];
    $data[&#39;mime&#39;] = $info[&#39;mime&#39;];
    return $data;
  }
  static function openAnyImage($imagePath){
    //得到图像的mime类型
    $mime = self::getImageInfo($imagePath)[&#39;mime&#39;];
    //根据不同的mime类型打开不同的图像
    switch ($mime){
      case &#39;image/png&#39;:
          $image = imagecreatefrompng($imagePath);
          break;
      case &#39;image/gif&#39;:
          $image = imagecreatefromgif($imagePath);
          break;
      case &#39;image/jpeg&#39;:
          $image = imagecreatefromjpeg($imagePath);
          break;
      case &#39;image/wbmp&#39;:
          $image = imagecreatefromwbmp($imagePath);
          break;
    }
    return $image;
  }

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