发布于 2014-11-14 15:17:05 | 151 次阅读 | 评论: 0 | 来源: 网友投递

这里有新鲜出炉的PHP面向对象编程,程序狗速度看过来!

PHP开源脚本语言

PHP(外文名: Hypertext Preprocessor,中文名:“超文本预处理器”)是一种通用开源脚本语言。语法吸收了C语言、Java和Perl的特点,入门门槛较低,易于学习,使用广泛,主要适用于Web开发领域。PHP的文件后缀名为php。


本文为大家讲解的是使用PHP遍历文件目录与清除目录中文件的实现详解,感兴趣的同学参考下。

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']) && $_REQUEST['act']=='list_dir') 
    { 
        if(emptyempty($_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> 


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