在文本框中提交联系表单默认文本

echo '<form action="' . esc_url( $_SERVER['REQUEST_URI'] ) . '" method="post">';
                                echo '<h5>';
                                echo 'Ask a question <br/>';
                                echo '</h5>';
                                echo '<p>';
                                echo '<input style="margin-left: 15px;" type="text" placeholder="Your Name (required)" name="cf-name" pattern="[a-zA-Z0-9 ]+" value="' . ( isset( $_POST["cf-name"] ) ? esc_attr( $_POST["cf-name"] ) : '' ) . '" size="29" />';
                                echo '</p>';
                                echo '<p>';
                                echo '<input style="margin-left: 15px;" type="email" placeholder="E-mail (required)" name="cf-email" value="' . ( isset( $_POST["cf-email"] ) ? esc_attr( $_POST["cf-email"] ) : '' ) . '" size="29" />';
                                echo '</p>';
                                echo '<p>';
                                echo '<input style="margin-left: 15px;" type="text" placeholder="Phone (required)" name="cf-subject" pattern="[0-9-() ]+" value="' . ( isset( $_POST["cf-subject"] ) ? esc_attr( $_POST["cf-subject"] ) : '' ) . '" size="29" />';
                                echo '</p>';
                                echo '<p>';
                                echo '<textarea style="margin-left: 15px; width: 246px;" rows="3" cols="28" placeholder="I am interested in: '.get_the_title().' " name="cf-message">' . ( isset( $_POST["cf-message"] ) ? esc_attr( $_POST["cf-message"] ) : '' ) . '</textarea>';
                                echo '</p>';
                                echo '<p><input type="submit" name="cf-submitted" value="Contact Agent" style="border-radius: 5px; color: #fff; margin-left: 15px; width: 247px; height: 38px; background-color: #27ae60;"></p>';
                                echo '</form>';
                                echo '<p style="font-size: x-small; font-weight: bold; margin-left: 22px;">';
                                echo 'By sending a request you agree to our Privacy Policy';
                                echo '</p>';


                                // if the submit button is clicked, send the email
                                if ( isset( $_POST['cf-submitted'] ) ) {

                                    // sanitize form values
                                    $name    = sanitize_text_field( $_POST["cf-name"] );
                                    $email   = sanitize_email( $_POST["cf-email"] );
                                    $subject = sanitize_text_field( $_POST["cf-subject"] );
                                    $message = esc_textarea( $_POST["cf-message"] );

                                    // get the blog administrator's email address
                                    $to = get_option( 'admin_email' );

                                    $headers = "From: $name <$email>" . "\r\n";

                                    // If email has been process for sending, display a success message
                                    if ( wp_mail( $to, $subject, $message, $headers ) ) {
                                    echo '<div>';
                                    echo '<h5>Thanks for contacting us, expect a response soon.</h5>';
                                    echo '</div>';
                                    } 
                                    else {
                                    echo '<h5>An unexpected error occurred.</h5>';
                                    }
                                }