What steps can be taken to debug and fix PHP code that is not functioning as expected when processing file uploads in a form?

When debugging PHP code that is not functioning as expected when processing file uploads in a form, ensure that the form has the correct enctype attribute set to "multipart/form-data". Additionally, check that the file upload size limit in php.ini is not exceeded and that the file upload directory has the correct permissions. 

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

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

Keywords

file uploads PHP code debugging form processing error fixing

Related Questions