opensource-socialnetwork checkbox

<?php

function interest_in_init() {
    ossn_add_hook('user', 'default:fields', 'interest_in');
}

function interest_in($hook, $type, $fields) {
    echo "<div id=\"interest-in\">";
    echo "<label class=\"checkbox-block\">" . ossn_print('interest_in') . "</label>";

    //Male
    $interestMale_checkbox = array(
        'name' => 'interestMale',
        'label' => ossn_print('male'),
            //'checked' => $user->interestMale == true ? 'checked' : null,
    );
    if ($user->interestMale == true) {
        $interestMale_checkbox['checked'] = 'checked';
    }
    echo ossn_plugin_view('input/checkbox', $interestMale_checkbox);

    //Female
    $interestFemale_checkbox = array(
        'name' => 'interestFemale',
        'label' => ossn_print('female'),
        'checked' => $user->interestFemale == true ? 'checked' : null, //different test. Not working also
    );
    echo ossn_plugin_view('input/checkbox', $interestFemale_checkbox);

    /* others options here */

    echo "</div>";
}

ossn_register_callback('ossn', 'init', 'interest_in_init', 100);