$_POST variables not working with $_FILES and multipart/form-data

问题

Problem: Whenever I change the enctype on my HTML form to multipart/form-data, $_POST variables do not populate in my php script. Users upload files along with filling out a form, and the files upload to the server but the $_POST variables do not populate.

Code:

My HTML form that collects the data text/picture.

index.php

<form name="myForm" METHOD="POST" ACTION="" enctype="multipart/form-data">
  <input type="text" name="text1" id="text1">
  <input type="text" name="text2" id="text2">
  <input type="file" name="filebutton" id="filebutton">
  <input type="submit" name="submit" id="submit">
</form>

My php script that attempts to update my MySQL database, as well as upload my file on my Ubuntu server is below.

upload.php

<?php
$uploaddir = "/var/www/img/pictures/";
$uploadfile = $uploaddir . basename($_FILES['filebutton']['name']);
move_uploaded_file($_FILES['filebutton']['tmp_name'], $uploadfile);
if (isset($_POST['filebutton'])) {  
    $pictureUpdate = ", PICTURE_FILEPATH = '" . $_POST['filebutton'] . "'";
} else {
    $pictureUpdate = "";
}
$connection = mysqli_connect("1.2.3.4","xxxx","xxxx","xxxx") or die("Caonnot connect to database.");
$update = "UPDATE table SET COLUMN1='" . $_POST['text1'] . "', COLUMN2='" . $_POST['text2'] . "' . $pictureUpdate . " where COLUMN3 = " . $_POST['text1'] . " ";
$update_sql = mysqli_query($connection, $update) or die("Cannot connect to mysql table. ". $update);
header("Location: " . $_SERVER['REQUEST_URL'] . "?success=1");
exit();

What I've Tried: This is the first time doing this, so I'm kinda freestyling here because I cannot seem to get this to work.

• Changed the enctype to application/x-www-form-urlencoded. Neither the $_POST or $_FILE data showed up in the upload.php file.
• Removed application/x-www-form-urlencoded altogether. When I do this, my $_POST variables work, but my file does not upload.
• Checked php.ini for post_max_size. Upon searching the internet, I've come across a couple StackOverflow topics concerning similar issues. From what I've gathered, if the file trying to be uploaded exceeds the value in post_max_size, then $_POST variables will not go through. The value in my php.ini file for post_max_size says "8M", and the test file picture being uploaded is 103 KiB.

How do I get $_POST data to work, as well as uploading a file from the same form?

回答1:

You just need to move your file stuff inside your if statement, and change $_POST['filebutton'] to $_FILES['filebutton']

Whenever you do a file upload, the files get populated in the $_FILES global variable, and the other fields get populated in the $_POST global variable.

<?php
$uploaddir = "/var/www/img/pictures/";
if (isset($_FILES['filebutton'])) {  
    $uploadfile = $uploaddir . basename($_FILES['filebutton']['name']);
    move_uploaded_file($_FILES['filebutton']['tmp_name'], $uploadfile);
    $pictureUpdate = ", PICTURE_FILEPATH = '" . $_FILES['filebutton'] . "'";
} else {
    $pictureUpdate = "";
}
$connection = mysqli_connect("1.2.3.4","xxxx","xxxx","xxxx") or die("Caonnot connect to database.");
$update = "UPDATE table SET COLUMN1='" . $_POST['text1'] . "', COLUMN2='" . $_POST['text2'] . "' . $pictureUpdate . " where COLUMN3 = " . $_POST['text1'] . " ";
$update_sql = mysqli_query($connection, $update) or die("Cannot connect to mysql table. ". $update);
header("Location: " . $_SERVER['REQUEST_URL'] . "?success=1");
exit();

try this code, and see what it does for you, if this works and the other does not then that means there's more to your code we need to solve the problem.

test.php

<form name="myForm" METHOD="POST" ACTION="" enctype="multipart/form-data">
  <input type="text" name="text1" id="text1">
  <input type="text" name="text2" id="text2">
  <input type="file" name="filebutton" id="filebutton">
  <input type="submit" name="submit" id="submit">
</form>
<xmp><?php if ($_SERVER['REQUEST_METHOD'] === 'POST') { var_dump($_FILES, $_POST); } ?></xmp>

output

array(1) {
  ["filebutton"]=>
  array(5) {
    ["name"]=>
    string(21) "scanParser.properties"
    ["type"]=>
    string(24) "application/octet-stream"
    ["tmp_name"]=>
    string(14) "/tmp/phpRm1Ytp"
    ["error"]=>
    int(0)
    ["size"]=>
    int(264)
  }
}
array(3) {
  ["text1"]=>
  string(1) "1"
  ["text2"]=>
  string(1) "2"
  ["submit"]=>
  string(6) "Submit"
}

来源：https://stackoverflow.com/questions/30654310/post-variables-not-working-with-files-and-multipart-form-data