dongmei9508 2012-08-01 09:36
浏览 38
已采纳

Php,DirectoryIterator

I am trying to understand part of the output I get from this code:

<?php
class DirectoryReader extends DirectoryIterator
    {

        function __construct($path)
        {

            parent::__construct($path);
        }


        function current()
        {
            return parent::getFileName();
        }

        function valid()
        {
            if(parent::valid())
            {
                if (!parent::isDir())
                {
                    parent::next();
                    return $this->valid();
                }
            return TRUE;
            }
            return FALSE;
        }

    } 

    try
    {

        $it = new DirectoryReader('C:\wamp\www');

        while($it->valid())
        {

            echo $it->current().'<br />';

            $it->next();
        }
    }
    catch(Exception $e)
    {
        echo 'No files Found!<br />';
    }
?>

At the code you can see that I pass this path to the constructor: C:\wamp\www,

What I don't understand: before I can see all the folders the first line is ., the second is .., and then I can see the folder names for example:

.
..
someFolder
someOtherFolder

I know that . present the current folder and .. is getting back at the folders hierarchy, but I can't understand why does it print the . then .. and then the folders? I really want to understand the action of this iterator, if can some one please help me understand I will be very thankful.

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  • doutan1875 2012-08-01 09:59
    关注

    The code parent::isDir() returns TRUE for the dot directories, meaning your own valid() method returns TRUE for them as well.

    You could edit your method to look at whether isDot() returns TRUE or FALSE and respond accordingly.

    function valid()
    {
        return $this->isDir() && !$this->isDot();
    }
    
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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