PHP遍历文件目录与清除目录中的文件-蒲公英云

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

<?php
function read_dir($dir,$file)
{
    $a =strpos($file,".php");
    if($a>0) 
    {
        unlink($dir . $file);
        echo "delete $dir$file <br>";
        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

<html>
<head>
    <meta http-enquiv="Content-Type" content="text/html;charset=gb2312">
    <title>查看目录</title>
</head>
<body>
    <table width="600" align="center">
        <tr>
            <th width="50%">文件名</th>
            <th width="25%">修改时间</th>
            <th width="25%">文件大小（k）</th>
        </tr>
    <?php
    //$dir = "./admin/";
    $dir = "c:/";
    $up_dir = "上级目录";
    $up_url = $dir;
    if(isset($_REQUEST['act']) && $_REQUEST['act']=='list_dir')
    {
        if(empty($_REQUEST['dir']))
        {
            $up_dir="目录为空！";
        }
        $dir = isset($_REQUEST['dir']) ? $_REQUEST['dir'] : $dir;
    }
    if(!is_dir($dir))
    {
        $up_dir="无效目录！";
    }
    ?>
        <tr>
            <td colspan="3">
            <?php 
            if(strpos($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 = $up_url ."/";
                }
                 echo "<a href=\"test.php?act=list_dir&dir=$up_url\">$up_dir</a>";
            } 
            else 
            {
                echo $up_dir;
                die();
            }
            ?>
            </td>
        </tr>
    <?php 
        $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 . $file)/1000;
                    echo "<tr><td>$file</td><td>$time</td><td>$size</td></tr>";
                }
                else
                {   
                    $time = date("Y-m-d H:i:s.", filectime($dir . $file));
                    $size = filesize($dir . $file)/1000;
                    $dir = $dir . $file ."/";
                    echo "<tr><td><a href =\"test.php?act=list_dir&dir=$dir\">$file</a></td><td>$time</td><td>$size</td></tr>";
                    $dir = $up_dir;
                }
            }
        }
    ?>
    </table>
<?php die();  ?>
</body>
</html>