PHP round()0.50降低值

Question

有没有什么方法可以降低任何低于.50的数字,包括.50？

例如:

round(1.49) => 1

round(1.51) => 2

round(1.50) => 2

有没有办法让它像这样:

round(1.49) => 1

round(1.51) => 2

round(1.50) => 1

Answer 1

使用PHP_ROUND_HALF_DOWN标志

echo round(1.49, 0, PHP_ROUND_HALF_DOWN);
echo PHP_EOL;
echo round(1.50, 0, PHP_ROUND_HALF_DOWN);
echo PHP_EOL;
echo round(1.51, 0, PHP_ROUND_HALF_DOWN);