属性:路径功能：构造方法生成水印的方法获取图片信息获取位置信息(123 456 789)创建图片资源合并图片资源重新命名保存图片生成缩略图的方法获取图片信息获取需要缩放的图片大小创建图片资源处理一下可能出现的黑边问题重新命名保存图片

class Image(){//定义图片路径static $path = '/';//构造方法public function __construct($path = '/') {$this->path = rtrim($path,'').'/';}}

static private function getImageInfo($imgPath){$info = getimagesize($imgPath);return array('width' => $info[0],'height'=> $info[1],'mime'  => $info['mime'],'name'  => basename($imgPath));}

static private function checksize($dstImgInfo,$waterImgInfo){if($waterImgInfo['width'] > $dstImgInfo['width'] || $waterImgInfo['height'] > $dstImgInfo['height']){return false;} else {return true;}}

static private function getPosition($dstImgInfo,$waterImgInfo,$postion){switch ($position) {case 1:$x = 0;$y = 0;break;case 2:$x = ceil(($desImgInfo['width'] - $waterImgInfo['width']) / 2);$y = 0;break;case 3:$x = $dstImgInfo['width'] - $waterImgInfo['width'];$y = 0;case 4:$x = 0;$y = ceil(($dstImgInfo['height'] - $waterImgInfo['height']) / 2);break;case 5:$x = ceil(($desImgInfo['width'] -$waterImgInfo['width']) / 2);$y = ceil(($dstImgInfo['height'] - $waterImgInfo['height']) / 2);break;case 6:$x = $dstImgInfo['width'] - $waterImgInfo['width'];$y = ceil(($dstImgInfo['height'] - $waterImgInfo['height']) / 2);break;case 7:$x = 0;$y = $dstImgInfo['height'] - $waterImgInfo['height'];break;case 8:$x = ceil(($desImgInfo['width'] - $waterImgInfo['width']) / 2);$y = $dstImgInfo['height'] - $waterImgInfo['height'];break;case 9:$x = $dstImgInfo['width'] - $waterImgInfo['width'];$y = $dstImgInfo['height'] - $waterImgInfo['height'];}return ['x' => $x,'y' => $y];}

static private function createImgRes($imgPath,$imgInfo){switch ($imgInfo['mime']) {case 'image/jpg':case 'image/jpeg':case 'image/pjpeg':$res = imagecreatefromjpeg($imgPath);break;case 'image/png':case 'image/x-png':$res = imagecreatefrompng($imgPath);break;case 'image/gif':$res = imagecreatefromgif($imgPath);break;case 'image/bmp':case 'image/wbmp':$res = imagecreatefromwbmp($imgPath);break;default:exit('图片我们不支持！');break;}return $res;}

static private function merge($dstImgRes,$waterImgRes,$waterImgInfo,$pos,$opacity){imagecopymerge($dstImgRes, $waterImgRes, $pos['x'], $pos['y'], 0, 0, $waterImgInfo['width'], $waterImgInfo['height'], $opacity);return $dstImgRes;}

static private function saveImg($newImgRes,$newPath,$dstImgInfo){switch ($dstImgInfo['mime']) {case 'image/jpg':case 'image/jpeg':case 'image/pjpeg':$res = imagejpeg($newImgRes,$newPath);break;case 'image/png':case 'image/x-png':$res = imagepng($newImgRes,$newPath);break;case 'image/gif':$res = imagegif($imgPath);break;case 'image/bmp':case 'image/wbmp':$res = imagewbmp($newImgRes,$newPath);break;default:exit('您的破图片我们不支持！');break;}
}

/*$dstImg:原图像
 *$waterImg:水印图片
 *$postion:水印的位置
 *$prefix:最终生成水印的图片名称前缀
 *$opacity:水印透明度
 */
static public function water($dstImg,$waterImg,$position = 9,$prefix = 'water_',$opacity = 50)
{   //判断图片是否存在$dstImg = self::$path.$dstImg;if(!file_exists($dstImg)){exit('目标图片不存在');}if(!file_exists($waterImg)){exit('水印图片不存在');}//通过自己定义的函数来获取图片和水印图片的信息$dstImgInfo = self::getImageInfo($dstImg);$waterImgInfo = self::getImageInfo($waterImg);//检查图片大小的函数if(!self::checkSize($dstImgInfo,$waterImgInfo)){exit('水印图片大小不能超过目标图片的大小');}//获取水印在目标图片的位置$pos = self::getPosition($dstImgInfo,$waterImgInfo,$position);//创建图片资源，准备合并$dstImgRes = self::createImgRes($dstImg,$dstImgInfo);$waterImgRes = self::createImgRes($waterImg,$waterImgInfo);//合并图片，生成新图片$newImgRes = self::merge($dstImgRes,$waterImgRes,$waterImgInfo,$pos,$opacity);$newPath = self::$path.$prefix.uniqid().$dstImgInfo['name'];imagedestroy($dstImgRes);imagedestroy($waterImgRes);imagedestroy($newImgRes);//生成新图片self::saveImg($newImgRes,$newPath,$dstImgInfo);return $newPath;
}

//生成缩略图的方法static public function thump($img,$width,$height,$prefix = 'thump_'){if(!file_exists($img)){exit('破图片不存在');}//获取图片的信息//getImageInfo()自定义函数$imgInfo = self::getImageInfo($img);//创建图片资源//createImgRes()自定义函数$imgRes  = self::createImgRes($img,$imgInfo);//获取新的大小//getNewSize()自定义函数--->得到最新的大小$newSize = self::getNewSize($width,$height,$imgInfo);//解决黑边问题//kidOfImage()自定义函数$newImgRes = self::kidOfImage($imgRes, $newSize, $imgInfo);//拼装缩略后的新的图片名字$newPath = $prefix.$newSize['width'].'X'.$newSize['height'].$imgInfo['name'];//保存图片self::saveImg($newImgRes,$newPath,$imgInfo);imagedestroy($newImgRes);//返回新的路径return $newPath;}

static private function getNewSize($width,$height,$imgInfo){$size = [];//判断缩略后的图的宽度，是不是比原图小if($imgInfo['width'] > $width){$size['width'] = $width;}//判断缩略图的高度是不是比原图小if($imgInfo['height'] > $height){$size['height'] = $height;}//即使小了，但是不成比例也不可以//如果缩略后的宽度是合适的，那么按照比例重新设高度if($imgInfo['width'] * $size['width'] > $imgInfo['height'] * $imgInfo['height']){$size['height'] = $imgInfo['height'] * $size['width'] / $imgInfo['width'];}else{//缩略后的高度是合适的，按照比例重新设置宽度$size['width'] = $imgInfo['width'] * $size['height'] / $imgInfo['height'];}return $size;}

    static private function kidOfImage($srcImg, $size, $imgInfo){$newImg = imagecreatetruecolor($size["width"], $size["height"]);$otsc = imagecolortransparent($srcImg);if ( $otsc >= 0 && $otsc < imagecolorstotal($srcImg)) {$transparentcolor = imagecolorsforindex( $srcImg, $otsc );$newtransparentcolor = imagecolorallocate($newImg,$transparentcolor['red'],$transparentcolor['green'],$transparentcolor['blue']);imagefill( $newImg, 0, 0, $newtransparentcolor );imagecolortransparent( $newImg, $newtransparentcolor );}imagecopyresized( $newImg, $srcImg, 0, 0, 0, 0, $size["width"], $size["height"], $imgInfo["width"], $imgInfo["height"] );imagedestroy($srcImg);return $newImg;}
}

Image::water('zhyunfe-com.jpg','2.jpg');Image::thump('./zhyunfe-com.jpg',50,50);