1.例1$num = 4999.944444; echo number_format($num).PHP_EOL; 5,000 echo number_format($num, 2); 4,999.94 2.例2$num = 4999.945444; echo number_format($num).PHP_EOL; 5,000 echo number_format($num, 2); 4,999.95 number_format是4舍5入的策略。将留的小数位后面一位作为四舍五入的标准。 3.例3$num = 4999.944444; echo number_format($num).PHP_EOL; 5,000 echo number_format($num, 1); 4,999.9 4.例4$num = 4999.954444; echo number_format($num).PHP_EOL; 5,000 echo number_format($num, 1); 5,000.0 |