<?
echo round(1.055);     //1
echo round(1.055,1);   //1.1
echo round(1.055,2);   //1.05echo round(1.555);      //2
echo round(1.555,1);    //1.6
echo round(1.555,2);    //1.55
?> 晕了,保留大于1位小数就出问题了....