$str = ‘150.2‘;
$str_s = $str * 100;
echo $str_s;
echo "-------";
echo (int)($str * 100);
echo ‘****--‘;
echo (int)($str_s);
echo ‘****--‘;
echo (int)(15020);
exit;
15020-------15019****--15019****--15020
原文：https://www.cnblogs.com/pansidong/p/10161755.html