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if ($shuzi== 0) {
echo "这是0!";
} elseif (($shuzi>0)&&($shuzi<=5)) {
echo "1到5";
} else if (($shuzi > 5) && ($shuzi <= 10)) {
echo "5到10";
} else if (($shuzi > 10) && ($shuzi <= 15)) {
echo "10到15";
} else if (($shuzi > 15) && ($shuzi <= 20)) {
echo "15到20";
} else if (($shuzi > 20) && ($shuzi <= 25)) {
echo "20到25";
}