PHP 取消链接函数帮助

Question

我编写了一个 PHP 脚本来删除在网格视图中选择的文件。这是我第一次这样做。该脚本在我的本地开发计算机上运行良好，但我不知道这是否是正确的方法。我想了解删除文件时可能会遇到哪些问题以及如何修改它以防止出现问题。

我正在查看此页面以获得基本想法： http://www.php .net/manual/en/function.unlink.php

<?php
// get required includes
require_once(ROOT_PATH.'user/controls/snippets/error_messages.php');
require_once(ROOT_PATH.'user/controls/accordion/get_user_name.php');

// ------------------------------------------------------------
// DELETE SELECTED FILES
// ------------------------------------------------------------
if(isset($_POST['delete_file']) && isset($_POST['checked2']))
{
    $checked = array_map('intval',$_POST['checked2']);
    $delete_list = implode(", ", $checked);

    // DB: get file names to delete
    $get_file_names = mysqli_query($conn, "SELECT FileName FROM downloads WHERE DownloadId IN ($delete_list) AND UserName = '$user_name'")
    or die($dataaccess_error);

    // delete files from server
    while($row = mysqli_fetch_array($get_file_names))
    {
        $dir = DOWNLOAD_DIRECTORY;
        $file_name = $row['FileName'];
        $file_to_delete = $dir.$file_name;
        unlink($file_to_delete);
    }

    // DB: delete selected file references from db
    $delete_selected = mysqli_query($conn, "DELETE FROM downloads WHERE DownloadId IN ($delete_list) AND UserName = '$user_name'")
    or die($dataaccess_error);

    if(mysqli_affected_rows($conn) > 0)
    {
        $effected_rows = mysqli_affected_rows($conn);
        echo "<div class='msgBox2b noBorder'>SUCCESS: ($effected_rows) FILE(S) have been DELETED..</div>";
    }
}
elseif(isset($_POST['delete_file']) && !isset($_POST['checked2']))
{
    echo $msg_error;
}
?>

谢谢！

编辑：这样会更好吗？

$fh = fopen($file_to_delete, 'w') or die($failed_to_open_file);
fclose($fh);
unlink($file_to_delete);

Answer 1

由于权限的原因，并非所有文件都可以取消链接，因此请检查该调用的返回值。