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

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 $ctax )
            ,$_POST[ $ctax ]

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

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Thanks, will try and work it out and get back to you. – user1684099 Feb 8 '13 at 12:46
@user26166 Feel free to edit my answer with a full & working solution. I'll approve it. – kaiser Feb 8 '13 at 13:24

3 textares for what purpose? or you meant 2 input´s and 1 texarea plus 1 input button? i would start reading at http://codex.wordpress.org/Function_Reference/comment_form

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3 textareas to catagorize comments for a review system, thanks. – user1684099 Feb 8 '13 at 11:50

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