<?php 
 /** 
  * 简单洗牌算法 
  */ 

 $card_num=54; //牌数 
 print_r(wash_card($card_num)); 

 function wash_card($card_num) 
 { 
     $cards=$tmp=array(); 
     for($i=0;$i<$card_num;$i++){ 
         $tmp[$i]=$i; 
     } 

     for($i=0;$i<$card_num;$i++){ 
         $index=rand(0,$card_num-$i-1); 
         $cards[$i]=$tmp[$index]; 
         unset($tmp[$index]); 
         $tmp=array_values($tmp); 
     } 
     return $cards; 
 } 
 ?> 

<?php

    function traverse($path = ‘.‘) {

        $current_dir = opendir($path); 

        while(($file = readdir($current_dir)) !== false) {                          

$sub_dir = $path . DIRECTORY_SEPARATOR . $file;                                                                                                                                                                                                     if($file == ‘.‘ || $file == ‘..‘) {

                          continue;

                     } else if(is_dir($sub_dir)) {    //如果是目录,进行递归

                         echo ‘Directory ‘ . $file . ‘:<br>‘;

                         traverse($sub_dir);

                     } else {    //如果是文件,直接输出

                         echo ‘File in Directory ‘ . $path . ‘: ‘ . $file . ‘<br>‘;

                     }

                 }

             }

             traverse(‘xxtt‘);

         ?>

php洗牌代码和遍历文件目录代码