Tsunamijaan

add_filter( 'post_class', 'post_class_example' );
  
function post_class_example( $classes ) {
    global $wp_query;
    if ( 0 == $wp_query->current_post ) {
        $classes[] = 'first-post';
    }
    return $classes;
}

Tsunamijaan

add_filter( 'comment_form_default_fields', 'comment_form_default_fields_example' );
  
function comment_form_default_fields_example( $fields ) {
    unset( $fields['url'] );
    return $fields;
}

Tsunamijaan

add_filter( 'login_message', 'login_message_example' );
  
function login_message_example( $message ) {
    $action = $_REQUEST['action'];
    if( $action == 'lostpassword' ) {
        $message = '<p class="message">Enter your email address, then check your inbox for the "reset password" link!</p>';
        return $message;
    }
    return;
}

Tsunamijaan

add_action('admin_menu', 'myplugin_menu_pages');
 
function myplugin_menu_pages() {
    // Add the top-level admin menu
    $page_title = 'My Plugin Settings';
    $menu_title = 'My Plugin';
    $capability = 'manage_options';
    $menu_slug = 'myplugin-settings';
    $function = 'myplugin_settings';
    add_menu_page($page_title, $menu_title, $capability, $menu_slug, $function);

Tsunamijaan

============Register Settings For a Plugin=======

function myplugin_register_settings() {
   add_option( 'myplugin_option_name', 'This is my option value.');
   register_setting( 'myplugin_options_group', 'myplugin_option_name', 'myplugin_callback' );
}
add_action( 'admin_init', 'myplugin_register_settings' );


============Creating an Options Page===========

Tsunamijaan

Step 1 – Registering the Settings Page======

//Admin Panel Settings
//Register Settings Function
function theme_settings_init(){
register_setting( 'theme_settings', 'theme_settings' );
}
 
//Add settings to page menu
function add_settings_page() {

Tsunamijaan

function create_meta_desc() {
    global $post;
if (!is_single()) { return; }
    $meta = strip_tags($post->post_content);
    $meta = strip_shortcodes($meta);
    $meta = str_replace(array("\n", "\r", "\t"), ' ', $meta);
    $meta = substr($meta, 0, 125);
    echo "<meta name='description' content='$meta' />";
}
add_action('wp_head', 'create_meta_desc');

Tsunamijaan

function the_breadcrumb() {
    if (!is_home()) {
        echo '<a href="';
        echo get_option('home');
        echo '">';
        bloginfo('name');
        echo "</a>  ";
        if (is_category() || is_single()) {
            the_category('title_li=');
            if (is_single()) {

Tsunamijaan

To create option tree list item metabox===


array(
'label'       => 'Team Social',
'id'          => 'team_links',
'type'        => 'list-item',
'section'     => 'social_icons_setting',
'settings'    => array(
    array(

Tsunamijaan

<?php
global $current_user;
get_currentuserinfo();
 
if ($current_user->ID == '') { 
    //show nothing to user
}
else { 
    //write code to show menu here
}