php 按最大尺寸 等比例缩放图片
$maxWidth = 180;//最大宽度$maxHeight = 125; //最大高度
$iSuofang = $arrPicwh['w']/$arrPicwh['h'];//原图的比例
$iSuo = $arrPicwh['h']/$arrPicwh['w'];
if ($arrPicwh['w'] > $arrPicwh['h'])//判断原图的宽高那个大
{
$dstW = $maxWidth;
$dstH = $maxWidth * $iSuo;
}else
{
$dstH = $maxHeight;
$dstW = $maxHeight * $iSuofang;
}
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