PHP generates verification code, thumbnail and watermark image class sharing, verification code watermark_PHP tutorial

PHP generates verification codes, thumbnails and watermarks for class sharing. Verification code watermark

encapsulates a class that can generate verification codes, thumbnails, and watermarks for sharing. For everyone

<&#63;php
class image{
  session_start();
  //验证码类
  static public function verify($code,$width=75,$height=25,$n=4){
    header("content-type:image/png");
    // 创建画布
    $img=imagecreatetruecolor($width,$height);
    // 设置背景色
    $bgcolor=imagecolorallocate($img,mt_rand(200,255),mt_rand(200,255),rand(200,255));
    // 将背景色填充
    imagefill($img,0,0,$bgcolor);
    // 绘制五条弧线
    for($i=0;$i<5;$i++){
      $arccolor=imagecolorallocate($img,mt_rand(200,255),mt_rand(200,255),rand(200,255));
      imagearc($img,mt_rand(5,($width-5)),mt_rand(5,($height-5)),mt_rand(5,($width-5)),mt_rand(5,($height-5)),mt_rand(0,360),mt_rand(0,360),$arccolor);
    }
    // 绘制一百个点
    for($i=0;$i<100;$i++){
      $pixelcolor=imagecolorallocate($img,mt_rand(200,255),mt_rand(200,255),rand(200,255));
      imagesetpixel($img,mt_rand(1,($width-1)),mt_rand(1,($height-1)),$pixelcolor);
    }
    // 绘制五条线段
    for($i=0;$i<5;$i++){
      $linecolor=imagecolorallocate($img,mt_rand(200,255),mt_rand(200,255),rand(200,255));
      imageline($img,mt_rand(1,($width-1)),mt_rand(1,($height-1)),mt_rand(1,($width-1)),mt_rand(1,($height-1)),$linecolor);
    }
    // 设置边框颜色
    $bdcolor=imagecolorallocate($img,mt_rand(150,200),mt_rand(150,200),rand(150,200));
    // 绘制一个矩形无填充边框
    imagerectangle($img,0,0,($width-1),($height-1),$bdcolor);
    // 设置验证码字符串
    $str='';
    for($i=1;$i<=$n;$i++){
      $str.=substr(str_shuffle($code),0,1);
    }
    $_SESSION['a']=$str;
    //
    for($i=0;$i<$n;$i++){
      $textcolor=imagecolorallocate($img,mt_rand(100,150),mt_rand(100,150),mt_rand(100,150));
      imagettftext($img,1/($n+1)*$width,mt_rand(-20,20),((1-$n/(5+$n))*$width/($n-1)+$i*1/($n+1)*$width),1/2*($height+3/5*$height),$textcolor,'1.ttf',substr($str,$i,1));
    }
    // 打印图像
    imagepng($img);
    // 释放资源
    imagedestroy($img);
    return $str;
  }
  //缩略图类
  /*
  *$source需要缩略的图片
  */
  static public function thumbnail($source,$deletesource=false,$width=180){
    $info=getimagesize($source);
    //getimagesize方法获得图像的详细信息
    $createFun=str_replace('/','createfrom',$info['mime']);
    //将getimagesize中的['mime']中的/替换，变为imagecreatefromjpeg方法
    $src=$createFun($source);
    //创建图像
    $dst_w=$width;
    //缩略图的宽
    $dst_h=$width/$info[0]*$info[1];
    //计算缩略图的高
    $dst=imagecreatetruecolor($dst_w,$dst_h);
    //新建一个真彩色图像
    imagecopyresampled($dst,$src,0,0,0,0,$dst_w,$dst_h,$info['0'],$info['1']);
    //重采样拷贝部分图像并调整大小
    $saveFun=str_replace('/','',$info['mime']);
    //设置保存函数
    $ext=strrchr($source,'.');
    //strrchr查找指定字符在字符串中的最后一次出现，返回包括其自身在内的剩余的字符串
    $thumbnailName=str_replace($ext,'',$source).'_thumbnail'.$ext;
    //设置保存路径
    if(!$deletesource){
      $saveFun($dst,$thumbnailName);
      //保存图像
    }else{
      $saveFun($dst,$thumbnailName);
      unlink($source);
      //删除原图
    }
    imagedestroy($src);
    //销毁资源
    imagedestroy($dst);
    //销毁资源
    return $thumbnailName;
 
  }
  //水印图类
  /*
  *$srcing水印图
  *$dsting原图
  */
  static public function watermark($dstimg,$srcimg){
    $dstinfo=getimagesize($dstimg);
    //getimagesize方法获取该图片的详细信息（该方法返回的是一个详细的数组）
    $srcinfo=getimagesize($srcimg);
    $createdst=str_replace('/','createfrom',$dstinfo['mime']);
    //将getimagesize方法返回的数组中的mime值中的/替换，结果为imagecreatefromjpeg
    $createsrc=str_replace('/','createfrom',$srcinfo['mime']);
    $dst=$createdst($dstimg);
    //替换后为imagecreatefromjpeg函数，创建一个图像
    $dst_w=imagesx($dst);
    //获取大图的宽
    $dst_h=imagesy($dst);
    //获取大图的高
    $src=$createsrc($srcimg);
    //替换后为imagecreatefromjpeg函数，创建一个图像
    $src_w=imagesx($src);
    //获取水印图的宽
    $src_h=imagesy($src);
    //获取水印图的高
    $watermaker=imagecopy($dst,$src,($dst_w-$src_w),($dst_h-$src_h),0,0,$src_w,$src_h);
    //将水印图复制在大图上
    $saveFun=str_replace('/','',$dstinfo['mime']);
    //将getimagesize返回数组中的['mime']中的斜杠替换为空，替换后的值为imagejpeg，即为保存函数
    $ext=strrchr($dstimg,'.');
    //strrchr查找指定字符在字符串中的最后一次出现，返回包括其自身在内的剩余的字符串
    $watermaker=str_replace($ext,'',$dstimg).'_water'.time().$ext;
    //保存名
    $saveFun($dst,$watermaker);
    //保存图片，第一个参数为要保存的图片，第二个参数为保存路径或保存名
    imagedestroy($dst);
    //销毁资源
    imagedestroy($src);
    //销毁资源
    return $watermaker;
 
  }
 
}
&#63;>

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