php如何处理青蛙跳台阶的问题（代码）

$number==2){ return $number; } $jumpSum=0; $jump1=1; $jump2=2; for($i=3;$i<=$number;$i++){ $jumpSum=$jump1+$jump2; $jump1=$jump2; $jump2=$jumpSum; } return $jumpSum; } $res=jumpFloor(10); var_dump($res);