How can one ensure that a form has been submitted before attempting to move an uploaded file in PHP?

To ensure that a form has been submitted before attempting to move an uploaded file in PHP, you can check if the form has been submitted by using the `$_POST` superglobal. If the form has been submitted, then you can proceed to move the uploaded file using the `move_uploaded_file` function. 

if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Check if the form has been submitted
    if (isset($_FILES['file'])) {
        $file = $_FILES['file'];
        
        // Check if the file was uploaded successfully
        if ($file['error'] === UPLOAD_ERR_OK) {
            // Move the uploaded file to a new location
            move_uploaded_file($file['tmp_name'], 'uploads/' . $file['name']);
            echo "File uploaded successfully!";
        } else {
            echo "Error uploading file.";
        }
    } else {
        echo "No file uploaded.";
    }
} else {
    echo "Form not submitted.";
}

Keywords

PHP form submission file upload validation error handling

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