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:

<?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


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>