Add a cpt icon the right way

cpt icon

<?php

/* ------------------------------------------------------------------*/
/* CUSTOM CPTs ICONS */
/* ------------------------------------------------------------------*/

// let's say you custom post type is : portfolio

add_action( 'admin_head', 'cpt_icons' );
function cpt_icons() {
	?>
    <style type="text/css" media="screen">
        #menu-posts-portfolio .wp-menu-image {
            background: url(<?php get_template_directory_uri(); ?>/images/portfolios-icon.png) no-repeat 6px -17px !important;
        }
        #menu-posts-portfolio:hover .wp-menu-image, #menu-posts-portfolio.wp-has-current-submenu .wp-menu-image {
            background-position:6px 7px!important;
        }
    </style>
<?php } ?>

You should probably use get_template_directory_uri() instead of bloginfo('template_url'), or the stylesheet equivalent (for child themes). Also, prefix your function :)

You're right Helen, Thanks