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// Hide WordPress Update Nag to All But Admins
function hide_update_notice_to_all_but_admin() {
    if ( !current_user_can( 'update_core' ) ) {
        remove_action( 'admin_notices', 'update_nag', 3 );
    }
}
add_action( 'admin_head', 'hide_update_notice_to_all_but_admin', 1 );

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// Create Proper WordPress Titles
add_theme_support( 'title-tag' );

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// Create Custom WordPress Dashboard Widget
function dashboard_widget_function() {
    echo '
        <h2>Custom Dashboard Widget</h2>
        <p>Custom content here</p>
    ';
}

function add_dashboard_widgets() {
    wp_add_dashboard_widget( 'custom_dashboard_widget', 'Custom Dashoard Widget', 'dashboard_widget_function' );
}
add_action( 'wp_dashboard_setup', 'add_dashboard_widgets' );

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// Remove All Dashboard Widgets
function remove_dashboard_widgets() {
    global $wp_meta_boxes;
    unset( $wp_meta_boxes['dashboard']['side']['core']['dashboard_quick_press'] );
    unset( $wp_meta_boxes['dashboard']['normal']['core']['dashboard_incoming_links'] );
    unset( $wp_meta_boxes['dashboard']['normal']['core']['dashboard_right_now'] );
    unset( $wp_meta_boxes['dashboard']['normal']['core']['dashboard_plugins'] );
    unset( $wp_meta_boxes['dashboard']['normal']['core']['dashboard_recent_drafts'] );
    unset( $wp_meta_boxes['dashboard']['normal']['core']['dashboard_recent_comments'] );
    unset( $wp_meta_boxes['dashboard']['side']['core']['dashboard_primary'] );
    unset( $wp_meta_boxes['dashboard']['side']['core']['dashboard_secondary'] );
    remove_meta_box( 'dashboard_activity', 'dashboard', 'normal' );
}
add_action( 'wp_dashboard_setup', 'remove_dashboard_widgets' );

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// Insert Custom Login Logo
function custom_login_logo() {
    echo '
        <style>
            .login h1 a { background-image: url(image.jpg) !important; background-size: 234px 67px; width:234px; height:67px; display:block; }
        </style>
    ';
}
add_action( 'login_head', 'custom_login_logo' );

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// Modify Admin Footer Text
function modify_footer() {
    echo 'Created by <a href="https://techpulsetoday.com/" target=_blank>TechPulseToday</a>.';
}
add_filter( 'admin_footer_text', 'modify_footer' );

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// Enqueue Styles and Scripts
function custom_scripts() {
    wp_enqueue_style( 'bootstrap', get_template_directory_uri() . '/css/bootstrap.min.css', array(), '3.3.6' );
    wp_enqueue_style( 'style', get_template_directory_uri() . '/css/style.css' );
    wp_enqueue_script( 'bootstrap', get_template_directory_uri() . '/js/bootstrap.min.js', array('jquery'), '3.3.6', true );
    wp_enqueue_script( 'script', get_template_directory_uri() . '/js/script.js' );
}

add_action( 'wp_enqueue_scripts', 'custom_scripts' );

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// Enqueue Google Fonts
function google_fonts() {
                wp_register_style( 'OpenSans', '//fonts.googleapis.com/css?family=Open+Sans:400,600,700,800' );
                wp_enqueue_style( 'OpenSans' );
        }
    wp_register_style( 'OpenSans', 'http://fonts.googleapis.com/css?family=Open+Sans:400,600,700,800' );
    wp_enqueue_style( 'OpenSans' );
}

add_action( 'wp_print_styles', 'google_fonts' );

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// Modify Excerpt Length
function custom_excerpt_length( $length ) {
    return 25;
}
add_filter( 'excerpt_length', 'custom_excerpt_length', 999 );

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// Change Read More Link
function custom_read_more_link() {
    return '<a href="' . get_permalink() . '">Read More</a>';
}
add_filter( 'the_content_more_link', 'custom_read_more_link' );

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// Change More Excerpt
function custom_more_excerpt( $more ) {
    return '...';
}
add_filter( 'excerpt_more', 'custom_more_excerpt' );

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// Disable Emoji Mess
function disable_wp_emojicons() {
    remove_action( 'admin_print_styles', 'print_emoji_styles' );
    remove_action( 'wp_head', 'print_emoji_detection_script', 7 );
    remove_action( 'admin_print_scripts', 'print_emoji_detection_script' );
    remove_action( 'wp_print_styles', 'print_emoji_styles' );
    remove_filter( 'wp_mail', 'wp_staticize_emoji_for_email' );
    remove_filter( 'the_content_feed', 'wp_staticize_emoji' );
    remove_filter( 'comment_text_rss', 'wp_staticize_emoji' );
    add_filter( 'tiny_mce_plugins', 'disable_emojicons_tinymce' );
}
add_action( 'init', 'disable_wp_emojicons' );
function disable_emojicons_tinymce( $plugins ) {
    if ( is_array( $plugins ) ) {
        return array_diff( $plugins, array( 'wpemoji' ) );
    } else {
        return array();
    }
}

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// Removes from admin menu
add_action( 'admin_menu', 'my_remove_admin_menus' );
function my_remove_admin_menus() {
    remove_menu_page( 'edit-comments.php' );
}
// Removes from post and pages
add_action( 'init', 'remove_comment_support', 100 );
function remove_comment_support() {
    remove_post_type_support( 'post', 'comments' );
    remove_post_type_support( 'page', 'comments' );
}
// Removes from admin bar
function mytheme_admin_bar_render() {
    global $wp_admin_bar;
    $wp_admin_bar->remove_menu( 'comments' );
}
add_action( 'wp_before_admin_bar_render', 'mytheme_admin_bar_render' );

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// Change Media Gallery URL
update_option( 'upload_url_path', 'http://s3.website.com/wp-content/uploads' );

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// Add 250 x 250 Custom Thumbnail Size
add_image_size( 'custom-thumbnail', 250, 250, true );

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<?php $thumb = wp_get_attachment_image_src( get_post_thumbnail_id($post->ID), 'custom-thumbnail' );

 echo $thumb[0]; ?>

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 the_post_thumbnail_url( $size );

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 // Add Categories for Attachments
function add_categories_for_attachments() {
    register_taxonomy_for_object_type( 'category', 'attachment' );
}
add_action( 'init' , 'add_categories_for_attachments' );

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// Add Tags for Attachments
function add_tags_for_attachments() {
    register_taxonomy_for_object_type( 'post_tag', 'attachment' );
}
add_action( 'init' , 'add_tags_for_attachments' );

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// Add Custom Excerpt to Pages
function add_page_excerpt() {
    add_post_type_support( 'page', array( 'excerpt' ) );
}
add_action( 'init', 'add_page_excerpt' );

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// Create a Global String
function global_string() {
    return 'String';
}

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<?php echo global_string(); ?>

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// Support Featured Images
add_theme_support( 'post-thumbnails' );

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// Support Search Form
add_theme_support( 'html5', array( 'search-form' ) );

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// Excluding pages from search
function exclude_pages_from_search() {
    global $wp_post_types;
    $wp_post_types['page']->exclude_from_search = true;
}
add_action( 'init', 'exclude_pages_from_search' );

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// Disable XML RPC
add_filter( 'xmlrpc_enabled', '__return_false' );
remove_action( 'wp_head', 'rsd_link' );
remove_action( 'wp_head', 'wlwmanifest_link' );

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// Escape HTML in <code> or <pre><code> tags.
function escapeHTML($arr) {
    if (version_compare(PHP_VERSION, '5.2.3') >= 0) {
        $output = htmlspecialchars($arr[2], ENT_NOQUOTES, get_bloginfo('charset'), false);
    }
    else {
        $specialChars = array(
            '&' => '&amp;',
            '<' => '&lt;',
            '>' => '&gt;'
        );

        // decode already converted data
        $data = htmlspecialchars_decode( $arr[2] );
        // escapse all data inside <pre>
        $output = strtr( $data, $specialChars );
    }
    if (! empty($output)) {
        return  $arr[1] . $output . $arr[3];
    }   else    {
        return  $arr[1] . $arr[2] . $arr[3];
    }
}
function filterCode($data) { // Uncomment if you want to escape anything within a <pre> tag
    //$modifiedData = preg_replace_callback( '@(<pre.*>)(.*)(<\/pre>)@isU', 'escapeHTML', $data );
    $modifiedData = preg_replace_callback( '@(<code.*>)(.*)(<\/code>)@isU', 'escapeHTML', $data );
    $modifiedData = preg_replace_callback( '@(<tt.*>)(.*)(<\/tt>)@isU', 'escapeHTML', $modifiedData );

    return $modifiedData;
}
add_filter( 'content_save_pre', 'filterCode', 9 );
add_filter( 'excerpt_save_pre', 'filterCode', 9 );

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// Create Custom Global Settings
function custom_settings_page() { ?>
    <div class="wrap">
    <h1>Custom Settings</h1>
    <form method="post" action="options.php">
        <?php
            settings_fields( 'section' );
            do_settings_sections( 'theme-options' );
            submit_button();
        ?>
    </form>
    </div>
<?php }

function custom_settings_add_menu() {
    add_theme_page( 'Custom Settings', 'Custom Settings', 'manage_options', 'custom-settings', 'custom_settings_page', null, 99 );
}
add_action( 'admin_menu', 'custom_settings_add_menu' );

// Example setting
function setting_twitter() { ?>
    <input type="text" name="twitter" id="twitter" value="<?php echo get_option('twitter'); ?>" />
<?php }

function custom_settings_page_setup() {
    add_settings_section( 'section', 'All Settings', null, 'theme-options' );
    add_settings_field( 'twitter', 'Twitter Username', 'setting_twitter', 'theme-options', 'section' );
    register_setting( 'section', 'twitter' );
}
add_action( 'admin_init', 'custom_settings_page_setup' );

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<?php echo get_option( 'twitter' ); ?>

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function remove_admin_bar() {
    remove_action( 'wp_head', '_admin_bar_bump_cb' );
}
add_action( 'get_header', 'remove_admin_bar' );

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// Add Open Graph Meta Tags
function meta_og() {
    global $post;
    if ( is_single() ) {
        if(has_post_thumbnail($post->ID)) {
            $img_src = wp_get_attachment_image_src(get_post_thumbnail_id( $post->ID ), 'thumbnail');
        } 
        $excerpt = strip_tags($post->post_content);
        $excerpt_more = '';
        if (strlen($excerpt) > 155) {
            $excerpt = substr($excerpt,0,155);
            $excerpt_more = ' ...';
        }
        $excerpt = str_replace('"', '', $excerpt);
        $excerpt = str_replace("'", '', $excerpt);
        $excerptwords = preg_split('/[\n\r\t ]+/', $excerpt, -1, PREG_SPLIT_NO_EMPTY);
        array_pop($excerptwords);
        $excerpt = implode(' ', $excerptwords) . $excerpt_more;
        ?>
<meta name="author" content="Your Name">
<meta name="description" content="<?php echo $excerpt; ?>">
<meta property="og:title" content="<?php echo the_title(); ?>">
<meta property="og:description" content="<?php echo $excerpt; ?>">
<meta property="og:type" content="article">
<meta property="og:url" content="<?php echo the_permalink(); ?>">
<meta property="og:site_name" content="Your Site Name">
<meta property="og:image" content="<?php echo $img_src[0]; ?>">
<?php
    } else {
            return;
    }
}
add_action('wp_head', 'meta_og', 5);

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// Create Custom Post Type
function create_custom_post() {
    register_post_type('custom-post', // slug for custom post type
        array(
        'labels' => array(
            'name' => __('Custom Post'),
        ),
        'public' => true,
        'hierarchical' => true, 
        'has_archive' => true,
        'supports' => array(
            'title',
            'editor',
            'excerpt',
            'thumbnail'
        ), 
        'can_export' => true,
        'taxonomies' => array(
                'post_tag',
                'category'
        )
    ));
}
add_action('init', 'create_custom_post');

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function twentyfifteen_resource_hints( $urls, $relation_type ) {
    // Checks whether the subject is carrying the source of fonts google and the `$relation_type` equals preconnect.
    // Replace `enqueue_font_id` the `ID` used in loading the source.
    if ( wp_style_is( 'enqueue_font_id', 'queue' ) && 'preconnect' === $relation_type ) {
        // Checks whether the version of WordPress is greater than or equal to 4.7
        // to ensure conmpatibilidade with older versions
        // because the 4.7 has become necessary to return an array instead of string
        if ( version_compare( $GLOBALS['wp_version'], '4.7-alpha', '>=' ) ) {
            // Array with url google fonts and crossorigin
            $urls[] = array(
                'href' => 'https://fonts.gstatic.com',
                'crossorigin',
            );
        } else {
            // String with url google fonts
            $urls[] = 'https://fonts.gstatic.com';
        }
    }
    return $urls;
}
add_filter( 'wp_resource_hints', 'twentyfifteen_resource_hints', 10, 2 );

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add_image_size( 'admin-list-thumb', 80, 80, false );

function wpcs_add_thumbnail_columns( $columns ) {

    if ( !is_array( $columns ) )
        $columns = array();
    $new = array();

    foreach( $columns as $key => $title ) {
        if ( $key == 'title' ) // Put the Thumbnail column before the Title column
            $new['featured_thumb'] = __( 'Image');
        $new[$key] = $title;
    }
    return $new;
}

function wpcs_add_thumbnail_columns_data( $column, $post_id ) {
    switch ( $column ) {
    case 'featured_thumb':
        echo '<a href="' . $post_id . '">';
        echo the_post_thumbnail( 'admin-list-thumb' );
        echo '</a>';
        break;
    }
}

if ( function_exists( 'add_theme_support' ) ) {
    add_filter( 'manage_posts_columns' , 'wpcs_add_thumbnail_columns' );
    add_action( 'manage_posts_custom_column' , 'wpcs_add_thumbnail_columns_data', 10, 2 );
}

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// Add Lead Class to First Paragraph
function first_paragraph( $content ) {
    return preg_replace('/<p([^>]+)?>/', '<p$1 class="lead">', $content, 1);
}
add_filter( 'the_content', 'first_paragraph' );