/**
* 舍去法取整 版本的 number_format() 函数
* @author leeyi <leeyisoft@qq.com>
*/
function number_format_floor($number, $decimals=0, $dec_point='.', $thousands_sep=',') {
$tmp = pow(10,$decimals);
return number_format(floor($tmp*($number))/$tmp, $decimals, $dec_point, $thousands_sep);
} 