How can you ensure that the form data is properly submitted and processed when dealing with file uploads in PHP?

When dealing with file uploads in PHP, you need to make sure that the form has the correct encoding type set to "multipart/form-data" and that the file upload input field has a name attribute. Additionally, you should check if the file was successfully uploaded before processing it further. Finally, move the uploaded file to the desired location on the server using move_uploaded_file() function. 

<form action="upload.php" method="post" enctype="multipart/form-data">
    <input type="file" name="file">
    <input type="submit" value="Upload">
</form>
```

```php
<?php
if(isset($_FILES['file'])){
    $file = $_FILES['file'];
    if($file['error'] === UPLOAD_ERR_OK){
        $uploadDir = 'uploads/';
        $uploadFile = $uploadDir . basename($file['name']);
        if(move_uploaded_file($file['tmp_name'], $uploadFile)){
            echo "File uploaded successfully.";
        } else {
            echo "Failed to move file.";
        }
    } else {
        echo "Error uploading file.";
    }
}
?>

Keywords

file uploads form data processing PHP functions error handling

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