使用PHP遍历文件目录与清除目录中文件的实现详解

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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

复制代码代码如下:

<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']) && $_REQUEST['act']=='list_dir')  
    {  
        if(emptyempty($_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！";  
    }  

    ?>  

        <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>  