Extra fields for post category in WordPress

functions.php

<?php
//add extra fields to category edit form callback function
function extra_category_fields( $tag ) {    //check for existing featured ID
    $t_id = $tag->term_id;
    $cat_meta = get_option( "category_$t_id");
    ?>
    <tr class="form-field">
        <th scope="row" valign="top"><label for="cat_meta[custom_color]"><?php _e('Custom Color'); ?></label></th>
        <td>
            <input type="text" name="cat_meta[custom_color]" id="cat_meta[custom_color]" value="<?php echo $cat_meta['custom_color'] ? $cat_meta['custom_color'] : ''; ?>"><br />
            <span class="description"><?php _e('Custom color for category in HEX format'); ?></span>
        </td>
    </tr>
    <?php
}

//add extra fields to category edit form hook
add_action ( 'edit_category_form_fields', 'extra_category_fields');

// save extra category extra fields callback function
function save_extra_category_fileds( $term_id ) {
    if ( isset( $_POST['cat_meta'] ) ) {
        $t_id = $term_id;
        $cat_meta = get_option( "category_$t_id");
        $cat_keys = array_keys($_POST['cat_meta']);
        foreach ($cat_keys as $key){
            if (isset($_POST['cat_meta'][$key])){
                $cat_meta[$key] = $_POST['cat_meta'][$key];
            }
        }
        //save the option array
        update_option( "category_$t_id", $cat_meta );
    }
}

// save extra category extra fields hook
add_action ( 'edited_category', 'save_extra_category_fileds');

index.php

<?php
//first current category ID
$cat_id = CATEGORY_ID;

//then i get the data from the database
$cat_data = get_option("category_$cat_id");

//and then i just display my category image if it exists
if ($cat_custom_color = $cat_data['custom_color']){
  print_r($cat_custom_color); // returns custom color for category
}

print_r($cat_data); // returns asssociate array with all custom fields for category