PHP缩略图类

<?php//缩略图类class Thumb{	public static $thumb_prefix = '';//缩略图前缀	public static $thumb_savePath = '';//缩略图保存路径	public static $thumb_width = '';//缩略图宽度	public static $thumb_height = '';//缩略图高度		public static function save($sPath){//保存为缩略图,传入一个实参		$imgArr = self::getImageInfo($sPath);//获取图片信息		if (is_array($imgArr)) {			//将三个静态属性以逗号为分隔拆分为数组，实现多张缩略图的生成			$thumb_prefix_arr = explode(',', self::$thumb_prefix);			$thumb_width_arr = explode(',', self::$thumb_width);			$thumb_height_arr = explode(',', self::$thumb_height);			$countP = count($thumb_prefix_arr);			$countW = count($thumb_width_arr);			$countH = count($thumb_height_arr);			if ($countP>0 && $countP==$countW && $countW==$countH) {				//遍历一个数组，生成多张缩略图				$reArr = array();				foreach ($thumb_prefix_arr as $key=>$value){					//生成空白画布并填充颜色					$image = imagecreatetruecolor($thumb_width_arr[$key], $thumb_height_arr[$key]);					$color = imagecolorallocate($image, 255, 255, 255);//白色					imagefill($image, 0, 0, $color);					//计算出缩略比例					$width_scale = $imgArr['width']/$thumb_width_arr[$key];//宽比					$height_scale = $imgArr["height"]/$thumb_height_arr[$key];//高比					$scale = $width_scale>$height_scale ? $width_scale : $height_scale;					//计算缩略图宽高					$width = $imgArr["width"]/$scale;					$height = $imgArr["height"]/$scale;					//到目标图片的位置					$dst_x = ($thumb_width_arr[$key]-$width)/2;					$dst_y = ($thumb_height_arr[$key]-$height)/2;					//获取原始图片资源并拷贝					$src_image = $imgArr["createFunName"]($sPath);//获取原始图片资源					imagecopyresized($image, $src_image, $dst_x, $dst_y, 0, 0, $width, $height, $imgArr["width"], $imgArr["height"]);					//保存并返回值					$re = $imgArr['saveFunName']($image,self::$thumb_savePath.'/'.$thumb_prefix_arr[$key].$imgArr['name']);					$reArr[$key] = $re;				}				//销毁缩略图资源及原图片资源，释放内存				imagedestroy($image);				imagedestroy($src_image);				return $reArr;//返回数组			}else{				return false;			}		}else{			return false;		}	}		protected static function getImageInfo($path){		if (is_file($path)) {			$imgArr = getimagesize($path);			if (is_array($imgArr)) {//如果$imgArr是一个数组，则说明$path是一个真实图片				//判断不同的图片类型，使用变量函数，生成图片资源:$createFunName,保存图片资源:$saveFunName				switch ($imgArr['mime']){					case 'image/jpeg':					case 'image/pjpeg':						$createFunName = 'imagecreatefromjpeg';						$saveFunName = 'imagejpeg';						break;					case 'image/png':						$createFunName = 'imagecreatefrompng';						$saveFunName = 'imagepng';						break;					case 'image/gif':						$createFunName = 'imagecreatefromgif';						$saveFunName = 'imagegif';						break;					default:						return false;										}				//获取原图片名称				$oldName = pathinfo($path,PATHINFO_BASENAME);				//返回图片信息数组				return array(						'name'=>$oldName,						'type'=>$imgArr['mime'],						'width'=>$imgArr[0],						'height'=>$imgArr[1],						'createFunName'=>$createFunName,						'saveFunName'=>$saveFunName				);			}		}else{			return false;		}	}}