问强制客户选中确认他们已阅读文档的复选框

EN

<?php
// Add Confirmation Checkbox on Product Single  
add_action( 'woocommerce_single_product_summary', 'woocommerce_cheat_sheet_confirm', 29 );  
    function woocommerce_cheat_sheet_confirm() {
        global $post;
        $cheat_sheet = get_field('cheat_sheet'); // Get Advanced Custom Field
        if ( ! empty( $cheat_sheet ) ) { // If it exists, add the confirmation box ?>                   
            <div id="cheat-sheet-confirmation" class="checkbox">
                <form>  
                    <label>
                        <input id="cheatsheetconfirm" name="cheatsheetconfirm" type="checkbox" value="isconfirmed"> I confirm that I have read the <a href="<?php echo $cheat_sheet['url']; ?>" />cheat sheet</a>.
                    </label>
                </form>
            </div>
        <?php } 
    }

    function cheatsheetConfirmation() { 
    if(isset($_REQUEST['cheatsheetconfirm']) && $_REQUEST['cheatsheetconfirm'] == 'on'){
        $is_checked = true;   
    }
    else {
        $is_checked = false;
    }

    if ($is_checked == false) {
        wc_add_notice( __( 'Please acknowledge that you have read the cheat sheet.', 'woocommerce' ), 'error' );
        return false;
    }

    return true;
}
add_action( 'woocommerce_add_to_cart_validation', 'cheatsheetConfirmation', 10, 3 );