如何在PHP中访问特定的数组索引并显示它？

所以在这个项目中，我有 3 个 PHP 文件，即index.php、processor.php和viewsubmission.php

我的index.php和processor.php两者都按我的预期工作得很好，我现在的问题是在viewsubmission.php.

当我运行这个文件时，它只显示：

有没有一种可能的方法可以在来自文本文件的数据之前显示文本？预期的输出应该是这样的。

第二个问题：如何显示新数据而不必删除正在显示的第一组数据。

index.php //包含我的表单

<form action = "Processor.php" method = "post" enctype="multipart/form-data">

    Student ID:<input type="text" name="studentId"><br>

    Student Name: <input type="text" name="studentName"><br>

    Activity Number: <input type="text" name="activityNumber"><br>

    Comment: <input type="text" name="comment"><br>

    File Upload (doc,docx, & pdf files only):<br><input type="file" name="fileupload"> <br><br>

    <button type="submit">Submit File</button>

</form>

Processor.php //对表单中的所有输入进行编码处理然后写入文本文件

//creating the name of the file

$newFileName = uniqid('',true) . "." . $FileExt;

//identify file destination

$fileDst = "uploads/" . $newFileName;

move_uploaded_file($TempFile, $fileDst);

//Write data in textfile

$file = fopen("uploads/data.txt", "a");

fwrite($file, $_POST['studentId'] . "\n");

fwrite($file, $_POST['studentName'] . "\n");

fwrite($file, $_POST['activityNumber'] . "\n");

fwrite($file, $_POST['comment'] . "\n");

fwrite($file, $fileDst . "\n");

fclose($file);

echo "<br><br>>New file Location: " . $fileDst . "<br>";

echo "Record Saved...";

viewsubmission.php //访问文件并读取其内容并显示

<?php

    $filePath = "uploads/data.txt";

    $content = file_get_contents($filePath);

    $values = explode("\n", $content);

    echo "<hr>";

    $numberofData = 0;

    foreach($values as $val){  

        echo $val . "<br>";

        $numberofData++;

    }

    $numberofData--;

    echo "<hr>";