PHP中的文件上传错误

Question

我如何才能真正知道是否通过文件上传选项将文件传递到服务器？

我）我使用如下形式：

<form name = "someForm" id = "someForm" method = "post" action = "saveFile.php">                
    <input type = "file" name = "upload1" id = "upload1" />
    <input type = "file" name = "upload2" id = "upload2" />                     
    <input type = "file" name = "upload3" id = "upload3" />
    <input type = "submit" id = "btnSubmit" value = "Submit" />
</form>

ii）在saveFile.php中，我使用：

说：

echo $_FILES['upload1']["size"]; 

除了其他人，但我得到了一个未定义的索引：upload1错误，但没有，我使用了：

echo $_POST['upload1'];  //returns filename

Answer 1

您需要将<form>编码指定为"multipart/form-data" ：

<form enctype = "multipart/form-data" name = "someForm" id = "someForm" method = "post" action = "saveFile.php">                
    <input type = "file" name = "upload1" id = "upload1" />
    <input type = "file" name = "upload2" id = "upload2" />                     
    <input type = "file" name = "upload3" id = "upload3" />
    <input type = "submit" id = "btnSubmit" value = "Submit" />
</form>

Answer 2

<form name="someForm" id="someForm" method="post"
    action="saveFile.php" enctype="multipart/form-data">

上载文件需要Enctype。

您可以通过$_FILES而不是$_POST或$_GET来访问它们：

echo $_FILES['upload1']['size'];

Answer 3

文件保存在：

print_r($_FILES); // NOT IN POST