PHP readdir while 循环不能正常工作

Question

我写了一个简短的 php 代码来显示目录中每个文件的图像和标题。问题是如果我运行代码很多文件得到 a 而不是图像。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.

之后清除变量

谢谢！

Answer 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++;
    }
}

PHP readdir while 循环不能正常工作

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