趣味編程PHP

1.斐波那契數

<?php // $arr=array[1,2,3,5,8,13,21,34,55]sum();function sum(){$arr[0]=1;$arr[1]=2;$sum=$arr[0]+$arr[1];for($i=2;$i<10;$i++){$arr[$i]=$arr[$i-1]+$arr[$i-2];$sum+=$arr[$i];}echo $sum;}?>

2.1000以內的羅馬數位轉換

<?php rom(863);function rom($n){$arr=array(0=>array("","I","II","III","IV","V","VI","VII","VIII","IX"),//個位1=>array("","X","XX","XXX","XL","L","LX","LXXX","XCC"),//十位2=>array("","C","CC","CCC","CD","D","DC","DCC","DCCC","CM")//百位);//echo $arr[0.5][1.5];exit;for($m=0,$i=1000;$m<3;$m++,$i/=10){$t=intval(($n%$i)/($i/10));echo $arr[2-$m][$t];}}

3.字串翻轉

<?php $str="we see you";$res=reverse($str);echo $res;function reverse($var){    $res="";    for($i=0,$j=strlen($var);$i<$j;$i++)     {        $res=$var[$i].$res;             }    return $res;}?>

更簡單的方法：php的strrev($string)函數，直接就翻轉函數。