custom css in head

function custom_xcss_wphead() {

    // CUSTOM CSS IN SPECIFIC POST
    $customCss  =   get_post_meta(get_the_ID(), 'xCustomCss', true);
    if($customCss && !is_home() && !is_category() && !is_search()) {
        $customCss = '<style type="text/css">'.$customCss.'</style>';
        echo $customCss;
    }

}
add_action('wp_head', 'custom_xcss_wphead');