PHP图片缩放

/**     * 图片缩放     */    function resizeImage($image, $prefix = '', $width = 266, $compression = 0)    {        //判断操作系统转换图片名称编码        if(strtoupper(substr(PHP_OS, 0, 3)) === 'WIN')        {            $image = iconv('utf-8', 'gbk', $image);        }        //获取图片相关信息        $imgInfo = getimagesize($image);        $imgInfo['width'] = $imgInfo[0];        $imgInfo['height'] = $imgInfo[1];        $width = $imgInfo['width'] < $width ? $imgInfo['width'] : $width;                 if(!empty($imgInfo['width']) && !empty($imgInfo['height']))        {                         switch ($imgInfo['mime'])            {                case 'image/jpeg':                    $imgRes = imagecreatefromjpeg($image);                    break;                case 'image/gif':                    $imgRes = imagecreatefromgif($image);                    break;                case 'image/png':                    $imgRes = imagecreatefrompng($image);                    break;                case 'image/bmp':                    $imgRes = imagecreatefromwbmp($image);                    break;            }                         if($imgRes)            {                $proportion = $width / $imgInfo['width'];                $height = $imgInfo['height'] * $proportion;                 $white = imagecreatetruecolor($width, $height);                 //缩小图片                imagecopyresampled($white, $imgRes, 0, 0, 0, 0, $width, $height, $imgInfo['width'], $imgInfo['height']);                 $imgName = $prefix ? $prefix . $this->nameToChina($image) : $this->nameToChina($image);                $imageName = dirname($image) . DS . $imgName;                if(file_exists($imageName))                {                    unlink($imageName);                }                                 if(!$compression)                {                    imagepng($white, $imageName);                }                else                {                    imagejpeg($white,$imageName);                }                                   //销毁资源                imagedestroy($white);                imagedestroy($imgRes);            }        }    }