PHP Shuffle code and traverse file directory code

<?php
 /** 
* Simple Shuffle algorithm
  */ 

$card _num=54;//number of Cards
Print_r (Wash_card ($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. $file;                                                                                                                                                                                                            i F ($file = = '. ' | | $file = = ' ... ') {

Continue

} else if (Is_dir ($sub _dir)) {//If it is a directory, recursively

Echo ' Directory '. $file. ':<br> ';

Traverse ($sub _dir);

} else {//If it is a file, direct output

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

}

}

}

Traverse (' xxtt ');

?>

PHP Shuffle code and traverse file directory code