PHP浮点型乘积取整

float.php

<?php
echo (0.58*100) . "<br>"; //58
echo (int)(0.58*100) . "<br>"; //57
echo (1234.11 * 100) . "<br>"; //123411
echo (int)(1234.11 * 100) . "<br>"; //123410
echo intval(1234.12 * 100) . "<br>"; //123411

echo floor(( 0.1 + 0.7 ) * 10) . "\n"; //返回 7 而不是8，
echo (int)(( 0.1 + 0.7 ) * 10) . "\n"; //返回7而不是8.

echo (int)round( 0.1 + 0.7 ) * 10); //8