php 图片处理类，缩略，水印_PHP教程

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发布时间：2016-07-20 11:06:50

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php 图片处理类，缩略，水印

class Image {

/**
* @var string $fileName 文件名
* @access private
*/
private $fileName = '';

/**
* @var gd resource $imageResource 原图像
* @access private
*/
private $imageResource = NULL;

/**
* @var int $imageWidth 原图像宽
* @access private
*/
private $imageWidth = NULL;

/**
* @var int $imageHeight 原图像高
* @access private
*/
private $imageHeight = NULL;

/**
* @var int $imageType 原图像类型
* @access private
*/
private $imageType = NULL;

/**
* @var int $newResource 新图像
* @access private
*/
private $newResource = NULL;

/**
* @var int $newResType 新图像类型
* @access private
*/
private $newResType = NULL;

/**
* 构造函数
* @param string $fileName 文件名
     */
public function __construct($fileName = NULL) {
  $this->fileName = $fileName;
  if ($this->fileName) {
   $this->getSrcImageInfo();
  }
}

/**
* 取源图像信息
* @access private
* @return void
*/
private function getSrcImageInfo() {
  $info = $this->getImageInfo();
  $this->imageWidth = $info[0];
  $this->imageHeight = $info[1];
  $this->imageType = $info[2];
}

/**
* 取图像信息
* @param string $fileName 文件名
* @access private
* @return array
*/
private function getImageInfo($fileName = NULL) {
  if ($fileName==NULL) {
   $fileName = $this->fileName;
  }
  $info = getimagesize($fileName);
  return $info;
}

/**
* 创建源图像GD 资源
* @access private
* @return void
*/
private function createSrcImage () {
$this->imageResource = $this->createImageFromFile();
}

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/**
* 跟据文件创建图像GD 资源
* @param string $fileName 文件名
* @return gd resource
*/
    public function createImageFromFile($fileName = NULL)
    {
  if (!$fileName) {
   $fileName = $this->fileName;
   $imgType = $this->imageType;
  }
        if (!is_readable($fileName) || !file_exists($fileName)) {
            throw new Exception('Unable to open file "' . $fileName . '"');
        }

  if (!$imgType) {
   $imageInfo = $this->getImageInfo($fileName);
   $imgType = $imageInfo[2];
  }

        switch ($imgType) {
  case IMAGETYPE_GIF:
   $tempResource = imagecreatefromgif($fileName);
   break;
  case IMAGETYPE_JPEG:
   $tempResource = imagecreatefromjpeg($fileName);
   break;
  case IMAGETYPE_PNG:
   $tempResource = imagecreatefrompng($fileName);
   break;
  case IMAGETYPE_WBMP:
   $tempResource = imagecreatefromwbmp($fileName);
   break;
  case IMAGETYPE_XBM:
   $tempResource = imagecreatefromxbm($fileName);
   break;
  default:
   throw new Exception('错误的图片格式，或图片有问

题！');
        }
  return $tempResource;
    }
/**
* 改变图像大小
* @param int $width 宽
* @param int $height 高
* @param string $flag 按什么方式改变 0=长宽转换成参数指定的 1=按比

例缩放，长宽约束在参数指定内，2=以宽为约束缩放，3=以高为约束缩放
* @return string
*/
public function resizeImage($width, $height, $flag=1) {
  global $cfg;
  $widthRatio = $width/$this->imageWidth;
  $heightRatio = $height/$this->imageHeight;
  switch ($flag) {
  case 1:
   if ($this->imageHeight

>imageWidth     $endWidth = $this->imageWidth;
    $endHeight = $this->imageHeight;
    //return;
   } elseif (($this->imageHeight * $widthRatio)

>$height) {
$endWidth = ceil($this->imageWidth *

$heightRatio);
    $endHeight = $height;
   } else {
    $endWidth = $width;
    $endHeight = ceil($this->imageHeight *

$widthRatio);
   }
   break;
  case 2:
   $endWidth = $width;
   $endHeight = ceil($this->imageHeight * $widthRatio);
   break;
  case 3:
   $endWidth = ceil($this->imageWidth * $heightRatio);
   $endHeight = $height;
   break;
  case 4:
   $endWidth2 = $width;
   $endHeight2 = $height;
   if ($this->imageHeight

>imageWidth     $endWidth = $this->imageWidth;
    $endHeight = $this->imageHeight;
    //return;
   } elseif (($this->imageHeight * $widthRatio)

$endWidth = ceil($this->imageWidth *

$heightRatio);
    $endHeight = $height;
   } else {
    $endWidth = $width;
    $endHeight = ceil($this->imageHeight *

$widthRatio);
   }
   break;
  case 5:
   $endWidth2 = $width;
   $endHeight2 = $height;
   if ($this->imageHeight > $height && $this-

>imageWidth > $width) {
//都大
$ratio = max($this->imageHeight/

$height,$this->imageWidth/$width);
   }elseif ($this->imageHeight > $height){
    $ratio = $this->imageHeight/$height;
   }elseif ( $this->imageWidth > $width){
    $ratio =$this->imageWidth/$width;
   }else{
    $ratio =1;
   }

   $endWidth = $this->imageWidth / $ratio;
   $endHeight = $this->imageHeight / $ratio;

   break;
  default:
   $endWidth = $width;
   $endHeight = $height;
   break;
  }
  if ($this->imageResource==NULL) {
   $this->createSrcImage();
  }
  if($flag == 5){
   //直接缩略
   $this->newResource = imagecreatefromjpeg($cfg

['path']['data'].'blank_thumb.jpg');
}elseif ($flag==4) {
$this->newResource = imagecreatetruecolor

($endWidth2,$endHeight2);
} else {
$this->newResource = imagecreatetruecolor

($endWidth,$endHeight);
  }
  $this->newResType = $this->imageType;
  if($flag == 5){
   $dest_x = ($width-$endWidth)/2;
   $dest_y = ($height-$endHeight)/2;
   imagecopyresampled($this->newResource, $this-

>imageResource, $dest_x, $dest_y, 0, 0, $endWidth, $endHeight,$this-

>imageWidth,$this->imageHeight);
}else{
imagecopyresampled($this->newResource, $this-

>imageResource, 0, 0, 0, 0, $endWidth, $endHeight,$this->imageWidth,$this-

>imageHeight);
}
}

/**
* 给图像加水印
* @param string $waterContent 水印内容可以是图像文件名，也可以是文

字
* @param int $pos 位置0-9可以是数组
* @param int $textFont 字体大字，当水印内容是文字时有效
* @param string $textColor 文字颜色，当水印内容是文字时有效
* @return string
*/
public function waterMark($waterContent, $pos = 0, $textFont=5,

$textColor="#ffffff") {
  $isWaterImage = file_exists($waterContent);
  if ($isWaterImage) {
   $waterImgRes = $this->createImageFromFile

($waterContent);
   $waterImgInfo = $this->getImageInfo($waterContent);
   $waterWidth = $waterImgInfo[0];
   $waterHeight = $waterImgInfo[1];
  } else {
   $waterText = $waterContent;
   //$temp = @imagettfbbox(ceil

($textFont*2.5),0,"./cour.ttf",$waterContent);
   if ($temp) {
    $waterWidth = $temp[2]-$temp[6];
    $waterHeight = $temp[3]-$temp[7];
   } else {
    $waterWidth = 100;
    $waterHeight = 12;
   }
  }
  if ($this->imageResource==NULL) {
   $this->createSrcImage();
  }
  switch($pos)
  {
  case 0://随机
   $posX = rand(0,($this->imageWidth - $waterWidth));
   $posY = rand(0,($this->imageHeight - $waterHeight));
   break;
  case 1://1为顶端居左
   $posX = 0;
   $posY = 0;
   break;
  case 2://2为顶端居中
   $posX = ($this->imageWidth - $waterWidth) / 2;
   $posY = 0;
   break;
  case 3://3为顶端居右
   $posX = $this->imageWidth - $waterWidth;
   $posY = 0;
   break;
  case 4://4为中部居左
   $posX = 0;
   $posY = ($this->imageHeight - $waterHeight) / 2;
   break;
  case 5://5为中部居中
   $posX = ($this->imageWidth - $waterWidth) / 2;
   $posY = ($this->imageHeight - $waterHeight) / 2;
   break;
  case 6://6为中部居右
   $posX = $this->imageWidth - $waterWidth;
   $posY = ($this->imageHeight - $waterHeight) / 2;
   break;
  case 7://7为底端居左
   $posX = 0;
   $posY = $this->imageHeight - $waterHeight;
   break;
  case 8://8为底端居中
   $posX = ($this->imageWidth - $waterWidth) / 2;
   $posY = $this->imageHeight - $waterHeight;
   break;
  case 9://9为底端居右
   $posX = $this->imageWidth - $waterWidth-20;
   $posY = $this->imageHeight - $waterHeight-10;
   break;
  default://随机
   $posX = rand(0,($this->imageWidth - $waterWidth));
   $posY = rand(0,($this->imageHeight - $waterHeight));
   break;
  }
  imagealphablending($this->imageResource, true);
  if($isWaterImage) {
   imagecopy($this->imageResource, $waterImgRes, $posX,

$posY, 0, 0, $waterWidth,$waterHeight);
  } else {
   $R = hexdec(substr($textColor,1,2));
   $G = hexdec(substr($textColor,3,2));
   $B = hexdec(substr($textColor,5));

   $textColor = imagecolorallocate($this-

>imageResource, $R, $G, $B);
imagestring ($this->imageResource, $textFont, $posX,

$posY, $waterText, $textColor);
  }
  $this->newResource = $this->imageResource;
  $this->newResType = $this->imageType;
}

/**
* 生成验证码图片
* @param int $width 宽
* @param string $height 高
* @param int $length 长度
* @param int $validType 0=数字,1=字母,2=数字加字母
* @param string $textColor 文字颜色
* @param string $backgroundColor 背景颜色
* @return void
*/
public function imageValidate($width, $height, $length = 4,

$validType = 1, $textColor = '#000000', $backgroundColor = '#ffffff') {
if ($validType==1) {
//$validString =

'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
   //$validLength = 52;
   //no i no l
   $validString =

'abcdefghjkmnopqrstuvwxyzABCDEFGHJKMNOPQRSTUVWXYZ';
   $validLength = 48;
  } elseif ($validType==2) {
   //$validString =

'0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
   //$validLength = 62;
   //no i no l no 1
   $validString =

'023456789abcdefghjkmnopqrstuvwxyzABCDEFGHJKMNOPQRSTUVWXYZ';
   $validLength = 57;
  } else {
   $validString = '0123456789';
   $validLength = 10;
  }

  srand((int)time());
  $valid = '';
  for ($i=0; $i   $valid .= $validString{rand(0, $validLength-1)};
  }
  $this->newResource = imagecreate($width,$height);
  $bgR = hexdec(substr($backgroundColor,1,2));
  $bgG = hexdec(substr($backgroundColor,3,2));
  $bgB = hexdec(substr($backgroundColor,5,2));
  $backgroundColor = imagecolorallocate($this->newResource,

$bgR, $bgG, $bgB);
  $tR = hexdec(substr($textColor,1,2));
  $tG = hexdec(substr($textColor,3,2));
  $tB = hexdec(substr($textColor,5,2));
  $textColor = imagecolorallocate($this->newResource, $tR,

$tG, $tB);
for ($i=0;$i imagestring($this->newResource,5,$i*$width/

$length+3,2, $valid[$i],$textColor);
  }
  $this->newResType = IMAGETYPE_JPEG;
  return $valid;

}

/**
* 显示输出图像
* @return void
*/
public function display($fileName='', $quality=60) {

  $imgType = $this->newResType;
  $imageSrc = $this->newResource;
        switch ($imgType) {
  case IMAGETYPE_GIF:
   if ($fileName=='') {
    header('Content-type: image/gif');
   }
   imagegif($imageSrc, $fileName, $quality);
   break;
  case IMAGETYPE_JPEG:
   if ($fileName=='') {
    header('Content-type: image/jpeg');
   }
   imagejpeg($imageSrc, $fileName, $quality);
   break;
  case IMAGETYPE_PNG:
   if ($fileName=='') {
    header('Content-type: image/png');
    imagepng($imageSrc);
   } else {
    imagepng($imageSrc, $fileName);
   }
   break;
  case IMAGETYPE_WBMP:
   if ($fileName=='') {
    header('Content-type: image/wbmp');
   }
   imagewbmp($imageSrc, $fileName, $quality);
   break;
  case IMAGETYPE_XBM:
   if ($fileName=='') {
    header('Content-type: image/xbm');
   }
   imagexbm($imageSrc, $fileName, $quality);
   break;
  default:
   throw new Exception('Unsupport image type');
        }
  imagedestroy($imageSrc);
}

/**
* 保存图像
* @param int $fileNameType 文件名类型 0使用原文件名，1使用指定的文

件名，2在原文件名加上后缀，3产生随机文件名
* @param string $folder 文件夹路径为空为与原文件相同
* @param string $param 参数$fileNameType为2时为文件名加后缀
* @return void
*/
public function save($fileNameType = 0, $folder = NULL, $param =

'_miniature') {
if ($folder==NULL) {
$folder = dirname($this-

>fileName).DIRECTORY_SEPARATOR;

  }
  $fileExtName = FileSystem::fileExt($this->fileName, true);
  $fileBesicName = FileSystem::getBasicName($this->fileName,

false);
  switch ($fileNameType) {
   case 1:
    //$newFileName = $folder.$param;
    $newFileName = $folder.basename($this-

>fileName);
    //var_dump($newFileName);
    break;
   case 2:
    $newFileName =

$folder.$fileBesicName.$param.$fileExtName;
    break;
   case 3:
    $tmp = date('YmdHis');
    $fileBesicName = $tmp;
    $i = 0;
    while (file_exists

($folder.$fileBesicName.$fileExtName)) {
     $fileBesicName = $tmp.$i;
     $i++;
    }
    $newFileName =

$folder.$fileBesicName.$fileExtName;
    break;
   default:
    $newFileName = $this->fileName;
    break;
  }
  $this->display($newFileName);
  return $newFileName;
}
/**
* 剪切出选定区域
*
* @param string $srcimgurl 原图
* @param string $endimgurl 处理过的图
* @param int $x 坐标原点X
* @param int $y 坐标原点Y
* @param int $endimg_w 最终图宽
* @param int $endimg_h 最终图高
* @param int $border_w 末坐标X
* @param int $border_h 末坐标Y
* @param int $scale 原图缩放情况百分比
* @param int $fix 是否自动取值
*/
public function cutimg

($srcimgurl,$endimgurl,$x,$y,$endimg_w,$endimg_h,$border_w,$border_h,$scale=

100,$fix=0){
  $path = dirname ($endimgurl);
  if (!is_dir($path)) {
   if(!@mkdir ($path, 0777)){
    die ("{$path} 此目录不能创建,文件创建失败");
   }
  }
  $ground_info = getimagesize($srcimgurl);
  switch($ground_info[2]){
   case 1:$im = imagecreatefromgif($srcimgurl);break;
   case 2:$im = imagecreatefromjpeg($srcimgurl);break;
   case 3:$im = imagecreatefrompng($srcimgurl);break;
   default:die("图片格式不允许$srcimgurl");
     }
  if($fix){//方便截取头像的一部分
   if($ground_info[0]    $border_w=$ground_info[0];
    $border_h=$endimg_h*$ground_info[0]/

$endimg_w;
   }elseif($ground_info[0]>$ground_info[1]){
    $border_h=$ground_info[1];
    $border_w=$endimg_w*$ground_info[1]/

$endimg_h;
   }else{
    $border_w=$ground_info[0];
    $border_h=$ground_info[1];
   }
  }
  $newim = imagecreatetruecolor($endimg_w, $endimg_h);
  $x=($x*100)/$scale;
  $y=($y*100)/$scale;
  $border_width=($border_w*100)/$scale;
  $border_height=($border_h*100)/$scale;
  imagecopyresampled($newim, $im, 0,0, $x,$y, $endimg_w,

$endimg_h, $border_width, $border_height );
  if(function_exists("imagegif")){
   switch($ground_info[2]){
    case 1:imagegif($newim,$endimgurl);break;
    case 2:imagejpeg($newim,$endimgurl);break;
    case 3:imagepng($newim,$endimgurl);break;
    default:die("errorMsg");
   }
  }elseif(function_exists("imagejpeg")){
   imagejpeg($newim,$endimgurl);
  }else{
   imagepng($newim,$endimgurl);
  }
  imagedestroy ($newim);
  imagedestroy ($im);
}
}