PHP四舍五入 保留几位小数 格式化数字

2. /** 1.number_format */
3. $number = 1234.56789;
4. $nombre_format_francais = number_format($number, 2, ',', ' ');
5. $english_format_number = number_format($number, 2, '.', '');
8. /** 2.round */
9. $number = 1234.56789;
10. echo round($number ,2);
13. /** 3.sprintf */
14. $formatted = sprintf ("￥%01.2f。", $money);
15. echo $formatted;
17. ?>

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几位, 四舍五入, PHP