Multiple comment forms and lists in single.php - wpquestions.com #9749

functions.php

/** 
 * Example how to setup up multiple comment forms and comments lists
 *
 * @version 0.0.5
 * @file    functions.php
 * @see     http://www.wpquestions.com/question/showLoggedIn/id/9749
 */


/**
 * Count comments by type and approval
 *
 * @version    0.0.3
 * @uses       global $wpdb
 * @param      array $type
 * @param      int   $post_id
 * @param      int   $approved
 * @return     array $comments
 */

function wpq_get_comments_count( $types = array(), $post_id, $approved = 1 )
{
    global $wpdb;
 
    // Default
    if ( ! is_array( $types ) || 0 == count( $types ) ) 
    {
            $types = array( '' );      
    }

    // Construct the IN	( ... )	part
    $tmp = array();
    foreach( $types as $type )
    {
       	$tmp[] = '%s';
    }
    $in	= join(	',', $tmp );

    // Use the vsprintf	part of	prepare:
    $data = $types;                                                 
    $data[] = $post_id;
    $data[] = $approved;

    $sql = $wpdb->prepare(
        "SELECT COUNT(*) AS cc FROM {$wpdb->comments} WHERE comment_type IN ({$in}) AND comment_post_ID = %d AND comment_approved = %d ",
         $data
    );

    return $wpdb->get_var( $sql );
}


/**
 * Display a hidden input field to set the comment type as 'extra'
 *
 * @return void
 */

function wpq_hidden_input_field_to_set_extra_comment_content_type()
{ 
    echo '<input name="wpq_comment_type" type="hidden" value="extra" />';
}


/**
 * Filter normal comments
 *
 * @uses   wpq_filter_comments()
 * @param  array $comments
 * @return array $comments
 */

function wpq_show_only_normal_comments( $comments )
{
    return wpq_filter_comments( array( '', 'pingback', 'trackback' ), $comments );
}


/**
 * Filter comments of the type 'extra'
 *
 * @uses   wpq_filter_comments()
 * @param  array $comments
 * @return array $comments
 */

function wpq_show_only_extra_comments( $comments )
{
    return wpq_filter_comments( array( 'extra' ), $comments );
}


/**
 * Filter comments by comment type
 *
 * @uses   wpq_filter_comments()
 * @param  string $comment_type
 * @param  array  $comments
 * @return array  $comments
 */

function wpq_filter_comments( $comment_type, $comments )
{
    $filtered_comments = array();

    foreach( (array) $comments as $key => $comment )
    {
        if( in_array( $comment->comment_type, $comment_type, true ) )
        {
            $filtered_comments[] = $comment;
        }
    }
    return $filtered_comments;
}


/**
 * Change the default comment form settings
 *
 * @param  array  $defaults
 * @return array  $defaults
 */

function wpq_change_comment_form_defaults( $defaults )
{  
    $change_some_default_settings = array(
        'comment_field'        => '<p class="comment-form-comment"><label for="comment_extra">' . _x( 'Extra Comment', 'noun' ) . '</label> <textarea id="comment_extra" name="comment" cols="45" rows="8" aria-required="true"></textarea></p>',
        'logged_in_as'         => '', 
        'comment_notes_before' => '',
        'comment_notes_after'  => '',
        'id_form'              => 'commentform_extra',
        'id_submit'            => 'submit_extra',
        'title_reply'          => __( 'Leave an Extra Reply' ),
        'title_reply_to'       => __( 'Leave an Extra Reply to %s' ),
        'cancel_reply_link'    => __( 'Cancel Extra reply' ),
        'label_submit'         => __( 'Post an Extra Comment' ),
        'format'               => 'xhtml',
    );
    return wp_parse_args( $change_some_default_settings, $defaults );
}


/**
 * Add the comment type to the comment data
 *
 * @uses   wpq_preprocess_comment()
 * @param  array  $commentdata
 * @return array  $commentdata
 */

function wpq_preprocess_comment_to_change_content_type( $commentdata )
{        
    $comment_type = filter_input( INPUT_POST, 'wpq_comment_type', FILTER_SANITIZE_STRING );

    if( ! empty( $comment_type ) )
    {
        $commentdata['comment_type'] = $comment_type;
    }
    return $commentdata;
}

add_filter( 'preprocess_comment', 'wpq_preprocess_comment_to_change_content_type', 99 );

single.php

/** 
 * Example how to setup up multiple comment forms and comments lists
 *
 * @version 0.0.4
 * @file    single.php
 * @see     http://www.wpquestions.com/question/showLoggedIn/id/9749
 */

// -----------------------
// Normal Comment Form #1:
//

add_filter(    'comments_array', 'wpq_show_only_normal_comments' );

// Comments template:
// comments_template( 'normal-comments.php', true );
comments_template( '', true );

remove_filter( 'comments_array', 'wpq_show_only_normal_comments' );      


// ----------------------
// Extra Comment Form #2:
//

add_action( 'comment_form',          'wpq_hidden_input_field_to_set_extra_comment_content_type' );
add_filter( 'comments_array',        'wpq_show_only_extra_comments' );
add_filter( 'comment_form_defaults', 'wpq_change_comment_form_defaults' );

// Comments template:
// comments_template( 'extra-comments.php', true );
comments_template( '', true );
 
remove_action( 'comment_form',          'wpq_hidden_input_field_to_set_extra_comment_content_type' );
remove_filter( 'comments_array',        'wpq_show_only_extra_comments' );
remove_filter( 'comment_form_defaults', 'wpq_change_comment_form_defaults' );