Add New Comment Form Field & Label.php

function add_new_comment_form_field($fields) {
    
	$fields['phone'] = '<p class="comment-form-phone"><label for="phone">' . __( 'Phone', 'wpsites.net' ) . '</label>' .
    
	'<input id="url" name="url" type="text" placeholder="E.T Phone Home Please" value="' . 
	
	esc_attr( $commenter['comment_author_phone'] ) . '" size="30" /></p>';
	
    return $fields;
}

add_filter('comment_form_default_fields','add_new_comment_form_field');