【问题标题】:PHP readdir while loop don't work cleanly [closed]PHP readdir while循环不能干净地工作[关闭]
【发布时间】:2015-08-28 22:11:36
【问题描述】:

我编写了一个简短的 php 代码,它显示一个图像和目录中每个文件的名称。问题是,如果我运行代码,许多文件会得到 a 而不是图像。因此,例如 .zip 文件位于 .txt 文件的前面。现在它将显示 txt 文件而不是 .zip 图像。

代码:

$file_dir = "upload/demofiles";
if ($handle = opendir($file_dir)) {
    $i = 1;
    while (false !== ($entry = readdir($handle))) {
    $format = pathinfo($entry, PATHINFO_EXTENSION);
    $file_path = $file_dir.'/'.$entry;

    if($format == "txt"){
        $myfile = fopen($file_path, "r") or die("Unable to open file!");
        $file_element = '<iframe src="'.$file_path.'" width="80px" style="height:80px" scrolling="no"></iframe>';
    }

    if($format == "png"){
        $myfile = fopen($file_path, "r") or die("Unable to open file!");
        $file_element = '<img src="'.$file_path.'" />';
    }

    if($format == "zip"){
        $myfile = fopen($file_path, "r") or die("Unable to open file!");
        $file_element = '<img width="64px" class="img" src="icons/zip.png" />';
        fclose($myfile);
    }

    if($format == "pdf"){
        $file_element = '<embed src="'.$file_path.'" width="80px" scrolling="no" style="height:80px">';
    }

    if(!isset($file_element)){
        $file_element = '<img class="img" width="64px" src="icons/file.png">';
    }

    if ($entry != "." && $entry != "..") {
        echo '<label style="display:inline-block; border:solid 1px;">
                <div>'.$file_element.'</div>
                <div>'.$entry.'</div>
        </label>';
    }
    $i++;
    }
}

为什么会这样?我认为应该在循环运行后清除变量。

谢谢!

【问题讨论】:

  • 为什么会这样? "The problem is that if i run the code many files get the a instead of an image"...得到一个??

标签: php loops iframe while-loop readdir


【解决方案1】:

试试这个代码:

$file_dir = "upload/demofiles";
if ($handle = opendir($file_dir)) {
    $i = 1;
    while (false !== ($entry = readdir($handle))) {
    $format = pathinfo($entry, PATHINFO_EXTENSION);
    $file_path = $file_dir.'/'.$entry;

    switch($format){
        case "txt":
            $myfile = fopen($file_path, "r") or die("Unable to open file!");
            $file_element = '<iframe src="'.$file_path.'" width="80px" style="height:80px" scrolling="no"></iframe>';
        break;

        case "png":
            $myfile = fopen($file_path, "r") or die("Unable to open file!");
            $file_element = '<img src="'.$file_path.'" />';
        break;

        case "zip":
            $myfile = fopen($file_path, "r") or die("Unable to open file!");
            $file_element = '<img width="64px" class="img" src="icons/zip.png" />';
            fclose($myfile);
        break;

        case "pdf":
            $file_element = '<embed src="'.$file_path.'" width="80px" scrolling="no" style="height:80px">';
        break;

        default:
            $file_element = '<img class="img" width="64px" src="icons/file.png">';
        break;
    }

    if ($entry != "." && $entry != "..") {
        echo '<label style="display:inline-block; border:solid 1px;">
                <div>'.$file_element.'</div>
                <div>'.$entry.'</div>
        </label>';
    }
    $i++;
    }
}

【讨论】:

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