multiple comment text areas

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I need to create a user comment form with three text areas and then display them in comments. I don’t know where to start – cannot find any plugin but would like to code it anyway. Any pointers much appreciated.

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  1. To add new fields, simply append them to the default fields with a plugin.

    <?php
defined( 'ABSPATH' ) AND exit;
/* Plugin Name: (#85059) Append form fields to comment form */

add_filter( 'comment_form_default_fields', 'wpse85059_comment_form_extd', 100 );
function wpse85059_comment_form_extd( $fields )
{
    // Append new fields …
    if ( 'comment_form_default_fields' === current_filter() )
    {
        foreach ( array( 'ctax_1', 'ctax_2', 'ctax_3' ) as $ctax )
            $fields[] = "<input value='{$ctax}' name='{$ctax}' />";
        return $fields;
    }
}

    Then there’s also the possibility to use comment meta data. More about it can be read in the Codex.

    To attach the meta data, you can hook into an action:

    add_filter( 'comment_id_fields', 'wpse85059_comment_meta_fields', 10, 3 );
function wpse85059_comment_meta_fields( $result, $id, $replytoid )
{
    add_action ( 'comment_post', 'wpse85059_comment_meta', 1 );

    foreach ( array( 'ctax_1', 'ctax_2', 'ctax_3' ) as $ctax )
        $result .= "<input value='{$ctax}' name='{$ctax}' />";

    return $result;
}
function wpse85059_comment_meta( $comment_id )
{
    // Only run once
    remove_filter( current_filter(), __FUNCTION__ );

    foreach ( array( 'ctax_1', 'ctax_2', 'ctax_3' ) as $ctax )
        add_comment_meta(
             $comment_id
            ,$ctax
            ,$_POST[ $ctax ]
            ,true
        );
}

    Note: This is not tested, but should give you a starting point.