php - php文件上传错误

Question

我如何真正知道我是否通过文件上传选项将文件传递到服务器？

i) 我使用如下表格:

<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"]; 

与其他人不同，但我得到一个Undefined index: upload1 错误，但不是什么时候，我使用:

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

Answer 1

您需要指定 <form>加密到"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>