php递归用法与递归目录实例

function demo($a) {

static $sum=1;

if($a > 1){

$sum*=$a;

demo(--$a);

}else{

$a=$sum;

}

return $sum;

}

echo demo(10);

class listdir{
var $depth;
var $dirname;
var $list;
var $tostring;

function listdir($dir){
$this->dirname=$dir;
$this->depth=0;
$this->tostring=”";
}

//把结果保存进多维数组
function getlist($dir=”"){
if($dir==”")$dir=$this->dirname;
$d=@dir($dir);
while(false!==($item=$d->read()))
{
if($item!=”.”&&$item!=”..”)
{
$path=$dir.”/”.$item;
if(is_dir($path)){
$this->depth+=1;
$this->getlist($path);
}else{
$this->list[$this->depth][]=$item;
}
}
}
$this->list[$this->depth]['directory']=$dir;
$this->depth-=1;
$d->close();
return $this->list;
}

//字符窜化结果

function tostring($dir=”"){
if($dir==”")$dir=$this->dirname;
$d=@dir($dir);
$this->tostring.=”

n”;
$this->tostring.=”Directory:”.$dir.”n”;
while(false!==($item=$d->read()))
{
if($item!=”.”&&$item!=”..”)
{
$path=$dir.”/”.$item;
if(is_dir($path)){
$this->depth+=1;
$this->tostring($path);
}else{
$this->tostring.=”
• ”.$item.”
n”;
}
}
}
$this->depth-=1;
$d->close();
$this->tostring.=”

输出结果：

Directory:jquery

• jquery-1.3.2.js


• jquery-1.3.2.min.js


• jquery-1.3.2-vsdoc2.js


• test.html


• common.js



Directory:jquery/d

• common.js


• jquery-1.3.2.js