$ _POST不起作用，$ _ GET起作用

Question

I've got kind of an annoying problem. When I submit the following code using method="post" and looking for the $_POST variable, the code doesn't recognize it. When I switch to method="get" and look for the $_GET variable it works fine. I would prefer not to use Get. Any suggestions? My final code will contain other inputs as well, however, I want the file input to be optional. So I need to process the code only if the file input is actually sent. Thanks for your help!

 //form.html.php
<form action="index.php" method="post" enctype="multipart/form-data">
<label id="upload">Select file to upload:
<input type="file" id="upload" name="foobar" /></label>
<input type="submit" value="Submit" />
</form>

//index.php
if(isset($_POST['foobar']))
{
//some code
}

However, this works fine

//form.html.php
<form action="index.php" method="get" enctype="multipart/form-data">
<label id="upload">Select file to upload:
<input type="file" id="upload" name="foobar" /></label>
<input type="submit" value="Submit" />
</form>

//index.php
if(isset($_GET['foobar']))
{
//some code
}

Answer 1

要获取文件，请使用$_FILES ，并且必须使用post方法。

Answer 2

You are uploading a file and do not have any inputs other then the "file" type input. Therefore there will not be any $_POST values sent put $_FILES array. And your form needs to have method="post" set.

Check this code out

echo "Upload: " . $_FILES["file"]["name"] . "<br />";
echo "Type: " . $_FILES["file"]["type"] . "<br />";
echo "Size: " . ($_FILES["file"]["size"] / 1024) . " Kb<br />";
echo "Stored in: " . $_FILES["file"]["tmp_name"];