"Was This Page Helpful?" Buttons

$wpide_helpful_types = array( 'post', 'page' );

add_filter( 'the_content', function ( $content ) use ( $wpide_helpful_types ) {
    if ( ! is_singular( $wpide_helpful_types ) || ! in_the_loop() || ! is_main_query() ) {
        return $content;
    }

    $id = get_the_ID();
    if ( isset( $_GET['wpide_helpful'] ) && (int) $_GET['wpide_helpful'] === $id ) {
        return $content . '<p class="wpide-helpful" role="status">Thanks for your feedback!</p>';
    }

    $form  = '<form class="wpide-helpful" method="post" action="" style="display:flex;gap:.5em;align-items:center;flex-wrap:wrap;margin-top:2em;">';
    $form .= '<span>Was this page helpful?</span>';
    $form .= '<button type="submit" name="wpide_helpful_vote" value="yes">Yes</button><button type="submit" name="wpide_helpful_vote" value="no">No</button>';
    $form .= '<input type="hidden" name="wpide_helpful_post" value="' . esc_attr( $id ) . '">' . wp_nonce_field( 'wpide_helpful', 'wpide_helpful_nonce', false, false ) . '</form>';

    return $content . $form;
}, 25 );

add_action( 'template_redirect', function () {
    if ( empty( $_POST['wpide_helpful_nonce'] ) || empty( $_POST['wpide_helpful_post'] ) ) {
        return;
    }

    $post_id = absint( $_POST['wpide_helpful_post'] );
    $vote    = isset( $_POST['wpide_helpful_vote'] ) && 'yes' === $_POST['wpide_helpful_vote'] ? 'yes' : 'no';
    $link    = get_permalink( $post_id );

    if ( ! $link || ! wp_verify_nonce( sanitize_key( wp_unslash( $_POST['wpide_helpful_nonce'] ) ), 'wpide_helpful' ) ) {
        return;
    }

    $ip  = isset( $_SERVER['REMOTE_ADDR'] ) ? sanitize_text_field( wp_unslash( $_SERVER['REMOTE_ADDR'] ) ) : '';
    $key = 'wpide_helpful_' . md5( wp_salt() . $post_id . $ip );

    if ( ! get_transient( $key ) ) {
        $meta = '_wpide_helpful_' . $vote;
        update_post_meta( $post_id, $meta, (int) get_post_meta( $post_id, $meta, true ) + 1 );
        set_transient( $key, 1, WEEK_IN_SECONDS );
    }

    wp_safe_redirect( add_query_arg( 'wpide_helpful', $post_id, $link ) );
    exit;
} );

foreach ( $wpide_helpful_types as $wpide_type ) {
    add_filter( "manage_{$wpide_type}_posts_columns", function ( $columns ) {
        $columns['wpide_helpful'] = 'Helpful';
        return $columns;
    } );
    add_action( "manage_{$wpide_type}_posts_custom_column", function ( $column, $post_id ) {
        if ( 'wpide_helpful' !== $column ) {
            return;
        }
        $yes = (int) get_post_meta( $post_id, '_wpide_helpful_yes', true );
        $no  = (int) get_post_meta( $post_id, '_wpide_helpful_no', true );
        echo $yes + $no ? esc_html( sprintf( '%d%% (%d votes)', round( $yes / ( $yes + $no ) * 100 ), $yes + $no ) ) : '—';
    }, 10, 2 );
}