php - 如何验证文件上传字段？

Question

我似乎无法验证文件上传字段，这是我的代码:

<?php

    if (isset($_POST['submit'])) {
        if ($_POST['uploadFile']) {
            echo "File uploaded";
        } else {
            echo "No file attempted to be uploaded";
        }
    }

?>

<form action="" method="post" enctype="multipart/form-data">
    <input type="file" name="uploadFile" />
    <input type="submit" name="submit" />
</form>

我犯了什么错误？

编辑

想出了我自己的解决方案，可能不是最好的，但它有效:

if (isset($_POST['submit'])) {
    $fileUpload = $_FILES['uploadFile'] ['name'];
        if (strlen($fileUpload) > 0) {
            echo "File uploaded.";
        } else {
            echo "No File attempted to be uploaded.";
        }
}

Answer 1

您正在寻找的超全局变量是 $_FILES。

var_dump($_FILES); //to see what's happening with the uploaded files

要确保发出 POST 请求，您可以使用以下行:

if($_SERVER['REQUEST_METHOD'] == 'POST') {
   //A post request!
}