function pw_remove_emojicons() 
{
    // Remove from comment feed and RSS
    remove_filter( 'the_content_feed', 'wp_staticize_emoji' );
    remove_filter( 'comment_text_rss', 'wp_staticize_emoji' );

    // Remove from emails
    remove_filter( 'wp_mail', 'wp_staticize_emoji_for_email' );

    // Remove from head tag
    remove_action( 'wp_head', 'print_emoji_detection_script', 7 );

    // Remove from print related styling
    remove_action( 'wp_print_styles', 'print_emoji_styles' );

    // Remove from admin area
    remove_action( 'admin_print_scripts', 'print_emoji_detection_script' );
    remove_action( 'admin_print_styles', 'print_emoji_styles' );
}
add_action( 'init', 'pw_remove_emojicons' );

add_filter('pre_user_email', 'skip_email_exist');
function skip_email_exist($user_email){
    define( 'WP_IMPORTING', 'SKIP_EMAIL_EXIST' );
    return $user_email;
}

function lt_dashboard_columns() {
    add_screen_option(
        'layout_columns',
        array(
            'max'     => 2,
            'default' => 1
        )
    );
}
add_action( 'admin_head-index.php', 'lt_dashboard_columns' );

function wp_trim_excerpt($text) { // Fakes an excerpt if needed
    global $post;
    if ( '' == $text ) {
        $text = get_the_content('');
        $text = apply_filters('the_content', $text);
        $text = str_replace('\]\]\>', ']]>', $text);
        $text = strip_tags($text);
        $excerpt_length = 55;
        $words = explode(' ', $text, $excerpt_length + 1);
        if (count($words)> $excerpt_length) {
            array_pop($words);
            array_push($words, '[...]');
            $text = implode(' ', $words);
        }
    }
    return $text;
}

function lt_html_excerpt($text) { // Fakes an excerpt if needed
    global $post;
    if ( '' == $text ) {
        $text = get_the_content('');
        $text = apply_filters('the_content', $text);
        $text = str_replace('\]\]\>', ']]>', $text);
        /*just add all the tags you want to appear in the excerpt --
        be sure there are no white spaces in the string of allowed tags */
        $text = strip_tags($text,'<p><br><b><a><em><strong>');
        /* you can also change the length of the excerpt here, if you want */
        $excerpt_length = 55; 
        $words = explode(' ', $text, $excerpt_length + 1);
        if (count($words)> $excerpt_length) {
            array_pop($words);
            array_push($words, '[...]');
            $text = implode(' ', $words);
        }
    }
    return $text;
}

/* remove the default filter */
remove_filter('get_the_excerpt', 'wp_trim_excerpt');

/* now, add your own filter */
add_filter('get_the_excerpt', 'lt_html_excerpt');

    function howdy_message($translated_text, $text, $domain) {  
        $new_message = str_replace('Howdy', 'Welcome', $text);  
        return $new_message;  
    }  
    add_filter('gettext', 'howdy_message', 10, 3);

// admin page for orders
add_action( 'admin_menu', 'lt_orders' );

function lt_orders() {
    add_menu_page( 'Orders', 'Orders',  'manage_options',  'lt-orders',   'lt_render', '', '3'   );
}
function lt_render() {
    global $title;
    print '<div class="wrap">';
    print "<h2>$title</h2>";
    $file = plugin_dir_path( __FILE__ ) . "lt_orders.php";
    if ( file_exists( $file ) )
        require $file;
    print '</div>';
}

function lt_loginlogo() {
	echo '<style type="text/css">
	.login h1 a { background-image: url('.get_bloginfo('template_directory').'/images/custom-login-logo.png) !important; }
	</style>';
}
add_action( 'login_head', 'lt_loginlogo' );

function lt_loginurl( $url ) {
	$url = home_url( '/' );
	return $url;
}
add_filter( 'login_headerurl', 'lt_loginurl' );

function lt_logintitle( $title ) {
	$title = get_bloginfo( 'name' );
	return $title;
}
add_filter( 'login_headertitle', 'lt_logintitle' );

<?php if (!is_user_logged_in()) { ?>
	<form action="<?php echo get_option('home'); ?>/wp-login.php" method="post">
	<input type="text" name="log" id="log" value="<?php if (isset($user_login)) echo esc_html(stripslashes($user_login), 1) ?>" size="20" />
	<input type="password" name="pwd" id="pwd" size="20" />
	<input type="submit" name="submit" value="Login" />
	<input name="rememberme" id="rememberme" type="hidden" checked="checked" value="forever" />
	<input type="hidden" name="redirect_to" value="<?php echo home_url(); ?>" />
	<a href="<?php echo wp_lostpassword_url( home_url() ); ?>">Forgot password or username?</a>
	</form>
<?php } else { 
	global $current_user;
	get_currentuserinfo(); ?>				
	<p>Welcome, <?php if($current_user->user_firstname) echo $current_user->user_firstname; else echo $current_user->display_name; ?>!</p>
	<a class="button" href="<?php echo wp_logout_url( home_url() ); ?>">Logout</a>
<?php } ?>

//custom avatar
function dw_addgravatar( $avatar_defaults ) {
	$myavatar = get_bloginfo('template_directory') . '/images/avatar.jpg';
	$avatar_defaults[$myavatar] = 'New Avatar';
	return $avatar_defaults;
	}
add_filter( 'avatar_defaults', 'dw_addgravatar' );

add_action( 'admin_menu', 'dianaworks_remove_menu_pages' );

function dianaworks_remove_menu_pages() {
/* only let administrators see these pages */
	if (!current_user_can('activate_plugins') {
		remove_menu_page('tools.php');	
		remove_menu_page('themes.php');	
		remove_menu_page('options-general.php');	
		remove_menu_page('plugins.php');	
		remove_menu_page('admin.php?page=wpcf7');
		remove_submenu_page( 'users.php' , 'user-new.php' );
		remove_submenu_page( 'edit.php' , 'edit-tags.php?taxonomy=category' );
		remove_submenu_page( 'edit.php' , 'edit-tags.php?taxonomy=post_tag' );
		remove_submenu_page( 'link-manager.php' , 'edit-tags.php?taxonomy=link_category' );
		}
	}