PHP文件上载错误-未定义索引

*****我在简介中的错误是什么

我一次上载多个图像文件，为此我使用POST方法将文件发布到uploader.php 出于测试目的，我尝试只上传第一个文件（即“分配”）。 现在当我选择一个文件并单击submit时，我的uploader.php没有得到发布的“分配”。它在第11行的C:\wamp\www\Pagination\u test\uploder.php中显示错误“未定义索引：分配”

表示“分配已过账”。 但为什么我会得到未定义索引的错误？？？？？

---

请帮帮我这里有个错误。。。您正在处理的文件不是过帐数据

        // NOT $_POST[] GLOBAL BUT RATHER $_FILES[] GLOBAL
        if (isset($_POST['allotment'])){

        echo $_POST['allotment']['name'];
        .
        .
        . --- and rest of uploading code (its working fine)--
        .---if ends---
        }

这就是它的写法：

        <?php 
            if (isset($_FILES['allotment'])){  //<== $_FILES NOT $_POST

                echo $_FILES['allotment']['name'];
                .
                .
                . --- and rest of uploading code (its working fine)--
                .---if ends---
            }

---

是的，伙计，它正在工作。谢谢你的帮助！
    Array ( [allotment] => Array ( [name] => smalllogo.png [type] => image/png [tmp_name] => C:\wamp\tmp\php8756.tmp [error] => 0 [size] => 27252 ) [MH-CET] => Array ( [name] => [type] => [tmp_name] => [error] => 4 [size] => 0 )

        // NOT $_POST[] GLOBAL BUT RATHER $_FILES[] GLOBAL
        if (isset($_POST['allotment'])){

        echo $_POST['allotment']['name'];
        .
        .
        . --- and rest of uploading code (its working fine)--
        .---if ends---
        }

        <?php 
            if (isset($_FILES['allotment'])){  //<== $_FILES NOT $_POST

                echo $_FILES['allotment']['name'];
                .
                .
                . --- and rest of uploading code (its working fine)--
                .---if ends---
            }