Question

我有一个访问者可以上传文件的页面，但这不是必需的，所以在我的脚本中我设置了一个条件，如果没有设置文件输入（我命名为＃upload; upload＆＃39;）或空的不要上传任何内容，文件名将等于＆＃39; file＆＃39;已经存在于db中;否则上传它。问题是条件不起作用;即使我将输入留空，也会执行上传脚本;我知道，因为我得到了脚本中声明的消息这是编码并谢谢

    //select exercice
$ex_query = mysqli_query($link, " SELECT * FROM exercices WHERE ID = '".$exercice_ID."' ");
$exercice = mysqli_fetch_assoc($ex_query);
// --- update script if post
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    if (isset($_FILES["upload"]) && !empty($_FILES["upload"])){
        $target_dir = "docs/";
        $date_f_n = date("Y-m-d_h-i-sa");
        $file_n = basename( $_FILES["upload"]["name"]);
        $file_n = $date_f_n.$file_n;
        $target_file = $target_dir . $file_n;
        $uploadOk = 1;
        $FileType = pathinfo($target_file,PATHINFO_EXTENSION);
        // Check if  file is a actual image or fake image
            $check = filesize($_FILES["upload"]["tmp_name"]);
            if($check !== false) {
                $uploadOk = 1;
            } else {
                $filesizeer = "File is not an image.";
                $uploadOk = 0;
            }
         // Check file size
        if ($_FILES["upload"]["size"] > 5000000) {
            $filesizeer = "Sorry, your file is too large.";
            $uploadOk = 0;
        }
        // Check if $uploadOk is set to 0 by an error
        if ($uploadOk == 0) {
            $error = "Sorry, your file was not uploaded.";
        // if everything is ok, try to upload file
        } else {
             if (move_uploaded_file($_FILES["upload"]["tmp_name"], $target_file)) {
            $upsuccess= "The file ". $file_n. " has been uploaded.";
            } else {
                $upfaled =  "Sorry, there was an error uploading your file.";
            }
        }//end else upload = 0
    }else{
        $file_n = $exercice['file'];
    }

Answer 1

与上传有关的 FIRST 事项是检查上传是否全部执行，并且成功。仅仅因为存在$_FILES['foo']并不意味着此foo文件的上传实际上已成功。

裸露的最低限度检查：

if ($_FILES['foo']['error'] !== UPLOAD_ERR_OK) {
   die("Upload failed with error code #" . $_FILES['foo']['error']);
}

甚至

if (isset($_FILES['foo']) && etc...)

如果你想要真正严格正确。

如果您想允许非上传，但仍然无法解决实际错误，请检查您要允许的特定错误代码为“ok”。错误代码在此处定义：http://php.net/manual/en/features.file-upload.errors.php

php上传文件条件不起作用

1 个答案: