使用PHP遍历文件目录与清除目录中文件的实现详解

今天无聊中练习了一下PHP遍历文件目录的程序，编写了以下两个程序，不过质量不是很好，轻拍~~~
1、清除PHP缓存文件

代码如下:

function read_dir($dir,$file)
{
$a =strpos($file,".php");

if($a>0)
{
unlink($dir . $file);
echo "delete $dir$file
";
return true;
}

if(strpos($file,".") === 0 || strpos($file,".") !== false ) return true;

if(strpos($file,".") === false || strpos($dir,"/") === false)
{
$dir = $dir . $file . "/";
if(!is_dir($dir)) return false;
$dh = opendir($dir);
while(($file = readdir($dh)) != false)
{
read_dir($dir,$file); //递归调用
}
}
}

function clear_caches()
{
$dir = "./temp/"; //要清除的PHP缓存文件目录

if(!is_dir($dir)) die("It is not a dir");
$dh = opendir($dir);

while(($file = readdir($dh) )!=false)
{
//var_dump($file);
read_dir($dir,$file);

}
}


?>

2、遍历目录中所有文件

代码如下:

//$dir = "./admin/";
$dir = "c:/";
$up_dir = "上级目录";
$up_url = $dir;

if(isset($_REQUEST['act']) && $_REQUEST['act']=='list_dir')
{
if(emptyempty($_REQUEST['dir']))
{
$up_dir="目录为空！";
}
$dir = isset($_REQUEST['dir']) ? $_REQUEST['dir'] : $dir;

}
if(!is_dir($dir))
{
$up_dir="无效目录！";
}

?>




$up_dir = $dir;
$dh = opendir($dir);
while(($file=readdir($dh)) != false)
{
if($file != "." && $file != ".." && $file != ".svn" )
{
if(strpos($file,".") !==false)
{
$time = date("Y-m-d H:i:s", filectime($dir . $file));
$size = filesize($dir . $file)/1000;
echo "";
}
else
{
$time = date("Y-m-d H:i:s.", filectime($dir . $file));
$size = filesize($dir . $file)/1000;
$dir = $dir . $file ."/";

echo "";
$dir = $up_dir;

}
}
}

?>

文件名	修改时间	文件大小（k）
if(strpos($up_dir,"上级目录")!==false) { //if($up_url=="") echo $up_dir; if($dir != "./admin/") { $up_url = substr($dir,0,-1); $k = strrpos($up_url,"/"); $up_url = substr($up_url,0,$k-strlen($up_url)); $up_url = $up_url ."/"; } echo "$up_dir"; } else { echo $up_dir; die(); } ?>
$file	$time	$size
$file	$time	$size