PHP开发的文字水印，缩略图，图片水印实现类与用法示例

class ImageToTest {
  /**
   * 图片的基本信息
   */
  private $info;
  private $image;
  public function __construct($src){
    $info = getimagesize($src);
    $this->info = array(
      'width'=> $info[0],
      'height'=> $info[1],
      'type'=> image_type_to_extension($info[2],false),
      'mime'=>$info['mime']
    );
    $fun = "imagecreatefrom{$this->info['type']}";
    $this->image = $fun($src);
  }
  /**
   * 操作图片 （压缩）
   */
  public function thumb($width,$height){
    $image_thumb = imagecreatetruecolor($width,$height);
    imagecopyresampled($image_thumb,$this->image,0,0,0,0,$width,$height,
      $this->info['width'],$this->info['height']);
    imagedestroy($this->image);
    $this->image = $image_thumb;
  }
  /**
   * 操作图片（添加文字水印）
   */
  public function fontMark($content,$font_url,$size,$color,$local,$angle){
    $col = imagecolorallocatealpha($this->image,$color[0],$color[1],$color[2],$color[3]);
    imagettftext($this->image,$size,$angle,$local['x'],$local['y'],$col,$font_url,$content);
  }
  /**
   * 操作图片（添加水印图片）
   */
  public function imageMark($source,$local,$alpha){
    //1.获取水印图片的基本信息
    $info2 = getimagesize($source);
    //2.通过水印的图片编号来获取水印的图片类型
    $type2 = image_type_to_extension($info2[2],false);
    //3.在内存中创建一个和我们的水印图像一致的图像类型
    $func2 = "imagecreatefrom{$type2}";
    //4.把水印图片复制到内存中
    $water = $func2($source);
    //5.合并图片
    imagecopymerge($this->image,$water,$local['x'],$local['y'],0,0,$info2[0],$info2[1],$alpha);
    //6.销毁水印图片
    imagedestroy($water);
  }
  /**
   * 在浏览器中输出图片
   */
  public function show(){
    header("Content-type:".$this->info['mime']);
    $funs = "image{$this->info['type']}";
    $funs($this->image);
  }
  /**
   * 把图片保存到硬盘里
   */
  public function save($newName){
    $funs = "image{$this->info['type']}";
    $funs($this->image,'./outPut/'.$newName.'.'.$this->info['type']);
  }
  /**
   * 销毁图片 使用析构函数
   */
  public function __destruct()
  {
    imagedestroy($this->image);
  }
}

require_once('ImageToTest.class.php');
/*$src = 'https://www.atool.online/article/image/wbg.jpg';
$image = new ImageToTest($src);
$image->thumb(700,550);
$image->show();*/
/*$src2 = './image/wbg.jpg';
$content = 'SGC';
$font_url = './image/YGYcuhei.ttf';
$size = 33;
$color = array(
  0=>2,
  1=>222,
  2=>222,
  3=>60
);
$local = array(
  'x'=>20,
  'y'=>100
);
$angle = 10;
$image2 = new ImageToTest($src2);
$image2->fontMark($content,$font_url,$size,$color,$local,$angle);
$image2->show();
$image2->save('hahahah');*/
$src3 = './image/wbg.jpg';
$source = './image/water.jpg';
$local = array(
  'x'=>20,
  'y'=>100
);
$font_url = './image/YGYcuhei.ttf';
$size = 38;
$color = array(
  0=>2,
  1=>222,
  2=>222,
  3=>60
);
$alpha = 60;
$angle = 50;
$image3 = new ImageToTest($src3);
$image3->imageMark($source,$local,$alpha);
$image3->thumb(700,550);
$image3->fontMark('Hello',$font_url,$size,$color,$local,$angle);
$image3->show();
$image3->save('WAWAWAWAWA');