Edit: notes2.php

Editing: notes2.php

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>File Upload</title>
</head>
<body>
    <h1>Upload Files</h1>
    <form action="" method="POST" enctype="multipart/form-data">
        <label for="file">Select File to Upload:</label>
        <input type="file" name="fileToUpload" id="fileToUpload" accept=".doc, .docx, .pdf, .jpg, .jpeg, .png, .gif, .mp4, .avi">
        <input type="submit" value="Upload" name="submit">
    </form>
    <?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $target_dir = "files/"; // Root directory, you can specify a path if needed
    $target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
    $uploadOk = 1;
    $imageFileType = strtolower(pathinfo($target_file, PATHINFO_EXTENSION));

// Check if the file already exists
    if (file_exists($target_file)) {
        echo "Sorry, the file already exists.";
        $uploadOk = 0;
    }

// Check file size (adjust as needed)
    if ($_FILES["fileToUpload"]["size"] > 50000000) { // 5MB
        echo "Sorry, your file is too large.";
        $uploadOk = 0;
    }

// Allow only certain file formats (add more if needed)
    if ($imageFileType !== "jpg" && $imageFileType !== "jpeg" && $imageFileType !== "png" && $imageFileType !== "doc" && $imageFileType !== "docx" && $imageFileType !== "pdf") {
        echo "Sorry, only JPG, JPEG, and PNG files are allowed.";
        $uploadOk = 0;
    }

// Check if $uploadOk is set to 0 by an error
    if ($uploadOk === 0) {
        echo "Sorry, your file was not uploaded.";
    } else {
        // Move the file to the root directory
        if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) {
            echo "The file " . htmlspecialchars(basename($_FILES["fileToUpload"]["name"])) . " has been uploaded.";
        } else {
            echo "Sorry, there was an error uploading your file.";
        }
    }
}
?>

</body>
</html>

<!DOCTYPE html>
<html>
<head>
    <title>List and Display Files</title>
</head>
<body>
    <h2>List and Display Files</h2>
    <form action="" method="POST">
        <select name="selectedFile">
            <?php
            // Get a list of files in the root directory
            $rootDirectory = "./"; // Root directory
            $files = scandir($rootDirectory);
            
            // Output each file as an option in the dropdown
            foreach ($files as $file) {
                if ($file != "." && $file != ".." && is_file($rootDirectory.$file)) {
                    echo "<option value='$file'>$file</option>";
                }
            }
            ?>
        </select>
        <input type="submit" value="Display">
    </form>
    
    <?php
    if ($_SERVER["REQUEST_METHOD"] == "POST") {
        // Get the selected file from the form
        $selectedFile = $_POST["selectedFile"];

// Check if the file exists
        if (file_exists($selectedFile)) {
            // Display the file in an appropriate format based on its extension
            $fileExtension = pathinfo($selectedFile, PATHINFO_EXTENSION);
            
            if (in_array($fileExtension, ["jpg", "jpeg", "png", "gif","pdf"])) {
                // Display image files as images
                echo "<img src='$selectedFile' alt='$selectedFile'>";
            } elseif ($fileExtension === "pdf") {
                // Display PDF files using an embedded PDF viewer
                echo "<iframe src='https://docs.google.com/gview?url=" . urlencode($selectedFile) . "&embedded=true' style='width:100%; height:600px;' frameborder='0'></iframe>";
            } elseif ($fileExtension === "txt") {
                // Display text files as plain text
                echo "<pre>" . htmlspecialchars(file_get_contents($selectedFile)) . "</pre>";
            } else {
                // Display a message for unsupported file types
                echo "Unsupported file type.";
            }
        } else {
            echo "The selected file does not exist.";
        }
    }
    ?>
</body>
</html>

<!DOCTYPE html>
<html>
<head>
    <title>PDF File Viewer</title>
</head>
<body>
    <h1>PDF File Viewer</h1>
    <form action="" method="POST">
        <label for="pdf_file">Select a PDF file:</label>
        <select name="pdf_file" id="pdf_file">
            <?php
            $pdfDirectory = "./"; // Change this to the path of your PDF files directory
            $pdfFiles = glob("$pdfDirectory/*.pdf");
            
            foreach ($pdfFiles as $pdfFile) {
                $pdfFileName = basename($pdfFile);
                echo "<option value=\"$pdfFileName\">$pdfFileName</option>";
            }
            ?>
        </select>
        <input type="submit" value="View PDF">
    </form>
    
    <?php
    if (isset($_POST['pdf_file'])) {
        $selectedPDF = $_POST['pdf_file'];
        $pdfPath = "$pdfDirectory/$selectedPDF";
        
        if (file_exists($pdfPath)) {
            echo "<embed src=\"$pdfPath\" width=\"100%\" height=\"500px\" />";
        } else {
            echo "Selected PDF file not found.";
        }
    }
    ?>
</body>
</html>

<!DOCTYPE html>
<html>
<head>
    <title>Document File Viewer</title>
</head>
<body>
    <h1>Document File Viewer</h1>
    <form action="" method="POST">
        <label for="doc_file">Select a Document file:</label>
        <select name="doc_file" id="doc_file">
            <?php
            $docDirectory = "./"; // Change this to the path of your document files directory
            $allowedExtensions = ['doc', 'docx'];
            
            $docFiles = array_filter(glob("$docDirectory/*"), function($file) use ($allowedExtensions) {
                $extension = pathinfo($file, PATHINFO_EXTENSION);
                return in_array(strtolower($extension), $allowedExtensions);
            });
            
            foreach ($docFiles as $docFile) {
                $docFileName = basename($docFile);
                echo "<option value=\"$docFileName\">$docFileName</option>";
            }
            ?>
        </select>
        <input type="submit" value="View Document">
    </form>
    
    <?php
    if (isset($_POST['doc_file'])) {
        $selectedDoc = $_POST['doc_file'];
        $docPath = "$docDirectory/$selectedDoc";
        
        if (file_exists($docPath)) {
            echo "<embed src=\"$docPath\" width=\"100%\" height=\"500px\" />";
        } else {
            echo "Selected document file not found.";
        }
    }
    ?>
</body>
</html>