static function transform_image($spath, $dpath, $data)
{
$datas = explode(':', $data);
$srcWidth = $datas[0];
$srcHeight = $datas[1];
$srcX = $datas[2];
$srcY = $datas[3];
$dstWidth = $datas[4];
$dstHeight = $datas[5];
img::load($spath);
$origWidth = img::getWidth();
$origHeight = img::getHeight();
$xRatio = $origWidth / $srcWidth;
$yRatio = $origHeight / $srcHeight;
$srcWidth = $dstWidth * $xRatio;
$srcHeight = $dstHeight * $yRatio;
$srcX = $srcX * $xRatio;
$srcY = $srcY * $yRatio;
img::transform($srcX, $srcY, $srcWidth, $srcHeight, $dstWidth, $dstHeight);
img::save($dpath);
img::unload();
}