tp5 number_format() 方法模板输出数字转换为两位小数

<div>{:number_format(9999999,2,'.','')}</div>
//9999999.00
//:number_format(要转换的数字,保留几位小数,'小数点以什么符号表示','千分位等逗号以什么符号显示')
number_format(1000000,'2')
//输出1,000,000.00

echo number_format("1000000",2,".","");
echo number_format("1000000",2,".","x");
echo number_format("1000000",2,"y","x");
//输出
//1000000.00
//1x000x000.00
//1x000x000y00