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This is m y code

<?php
//marcelokayata

//mentions
define( 'BP_MESSAGES_AUTOCOMPLETE_ALL', true );
//-----------------------------------------------------marcelokayata
// Add Shortcode
function teste_avatar_shortcode() {

        ob_start();

        global $post;

        $current_user = wp_get_current_user();
        /*echo 'Username: ' . $current_user->user_login . '<br />';
        echo 'User email: ' . $current_user->user_email . '<br />';
        echo 'User first name: ' . $current_user->user_firstname . '<br />';
        echo 'User last name: ' . $current_user->user_lastname . '<br />';
        echo 'User display name: ' . $current_user->display_name . '<br />';
        echo 'User ID: ' . $current_user->ID . '<br />';*/

        if($current_user->ID!=0){

            echo get_avatar_url($current_user->ID);
            echo get_avatar($current_user->ID);

        }

        $output = ob_get_contents();
        ob_end_clean();
        return $output;

}
add_shortcode( 'teste_avatar', 'teste_avatar_shortcode' );