Web Design Leaves

<?php if( ( is_home() || is_front_page() ) && !is_paged() ) : ?>
<p>Home top page</p>
<?php endif; ?>

function is_front_page() {
  global $wp_query;

  if ( ! isset( $wp_query ) ) {
    _doing_it_wrong( __FUNCTION__, __( 'Conditional query tags do not work before the query is run. Before then, they always return false.' ), '3.1.0' );
    return false;
  }

  //WP_Query の同名のメソッドの実行結果を返している
  return $wp_query->is_front_page();
}

public function is_front_page() {
  // most likely case
  if ( 'posts' == get_option( 'show_on_front' ) && $this->is_home() ) {
    return true;
  } elseif ( 'page' == get_option( 'show_on_front' ) && get_option( 'page_on_front' ) && $this->is_page( get_option( 'page_on_front' ) ) ) {
    return true;
  } else {
  return false;
  }
}

# BEGIN WordPress
<IfModule mod_rewrite.c>  #mod_rewrite が使用できる場合
RewriteEngine On  #mod_rewrite の機能を有効に
RewriteBase /wp/  #Rewrite 処理のベースとなる URL の指定
RewriteRule ^index\.php$ - [L]  #ファイル名が index.php なら処理を終了
RewriteCond %{REQUEST_FILENAME} !-f  #指定したファイルが存在しなければ
RewriteCond %{REQUEST_FILENAME} !-d  #且つ指定したディレクトリが存在しなければ
RewriteRule . /wp/index.php [L]  #すべてのリクエスト(.)は /wp/index.php に書き換え
</IfModule>

# END WordPress   

<?php  /* index.php */
/**
 * Front to the WordPress application. This file doesn't do anything, but loads
 * wp-blog-header.php which does and tells WordPress to load the theme.
 */

/**
 * Tells WordPress to load the WordPress theme and output it.
 * @var bool
 */
define('WP_USE_THEMES', true);

/** Loads the WordPress Environment and Template */
require( dirname( __FILE__ ) . '/wp-blog-header.php' );

<?php  /* wp-blog-header.php */
/**
 * Loads the WordPress environment and template.
 * @package WordPress
 */
if ( !isset($wp_did_header) ) {
  $wp_did_header = true;
  // ① Load the WordPress library.
  require_once( dirname(__FILE__) . '/wp-load.php' );
  // ② Set up the WordPress query.
  wp();
  // ③ Load the theme template.
  require_once( ABSPATH . WPINC . '/template-loader.php' );
}

 /* wp-load.php 抜粋*/
define( 'ABSPATH', dirname( __FILE__ ) . '/' );

require_once( ABSPATH . 'wp-config.php' );

/* wp-config.php　一部抜粋 */
/** WordPress のためのデータベース名 */
define('DB_NAME', 'database_name_here');

/** MySQL データベースのユーザー名 */
define('DB_USER', 'username_here');

/** MySQL データベースのパスワード */
define('DB_PASSWORD', 'password_here');

/** MySQL のホスト名 */
define('DB_HOST', 'localhost');

/** データベースのテーブルを作成する際のデータベースの文字セット */
define('DB_CHARSET', 'utf8');

/** データベースの照合順序 (ほとんどの場合変更する必要はありません) */
define('DB_COLLATE', '');

/** Sets up WordPress vars and included files. */
require_once(ABSPATH . 'wp-settings.php');

//wp-settings.php（抜粋）
/**
 * Used to set up and fix common variables and include
 * the WordPress procedural and class library.
 * Allows for some configuration in wp-config.php (see default-constants.php)
 * @package WordPress
 * Stores the location of the WordPress directory of functions,classes,and core content.
 * @since 1.0.0
 */
define( 'WPINC', 'wp-includes' );

// Include files required for initialization.
require( ABSPATH . WPINC . '/load.php' );
require( ABSPATH . WPINC . '/default-constants.php' );
require_once( ABSPATH . WPINC . '/plugin.php' );

・・・中略・・・

// Load early WordPress files.
require( ABSPATH . WPINC . '/compat.php' );
require( ABSPATH . WPINC . '/class-wp-list-util.php' );
require( ABSPATH . WPINC . '/functions.php' );
require( ABSPATH . WPINC . '/class-wp-matchesmapregex.php' );
require( ABSPATH . WPINC . '/class-wp.php' );
require( ABSPATH . WPINC . '/class-wp-error.php' );
require( ABSPATH . WPINC . '/pomo/mo.php' );

// Include the wpdb class and, if present, a db.php database drop-in.
global $wpdb;
require_wp_db();

// Set the database table prefix and the format specifiers for database table columns.
$GLOBALS['table_prefix'] = $table_prefix;
wp_set_wpdb_vars();

// Start the WordPress object cache, or an external object cache if the drop-in is present.
wp_start_object_cache();

// Attach the default filters.（デフォルトフィルタの読み込み）
require( ABSPATH . WPINC . '/default-filters.php' );

・・・中略・・・

// Load most of WordPress.（wp-includes にあるほとんどのファイルの読み込み）
require( ABSPATH . WPINC . '/class-wp-walker.php' );
require( ABSPATH . WPINC . '/class-wp-ajax-response.php' );
require( ABSPATH . WPINC . '/formatting.php' );
require( ABSPATH . WPINC . '/capabilities.php' );
・・・
・・・中略・・・

/* Fires once all must-use and network-activated plugins have loaded. */
do_action( 'muplugins_loaded' );
・・・
/* Fires once activated plugins have loaded. */
do_action( 'plugins_loaded' );
・・・
/**
 * WordPress Query object
 *
 * @global WP_Query $wp_the_query
 * @since 2.0.0
 */
$GLOBALS['wp_the_query'] = new WP_Query();
//$wp_the_query オブジェクト（WP_Queryクラスのインスタンス）の生成
//スーパーグローバル変数 $GROBALS に格納

/**
 * Holds the reference to @see $wp_the_query
 * Use this global for WordPress queries
 *
 * @global WP_Query $wp_query
 * @since 1.5.0
 */
$GLOBALS['wp_query'] = $GLOBALS['wp_the_query'];
//$wp_query オブジェクトに $wp_the_query オブジェクトをコピー
//$GLOBALS['wp_the_query'] は $GLOBALS['wp_query']のバックアップ

/**
 * Holds the WordPress Rewrite object for creating pretty URLs
 *
 * @global WP_Rewrite $wp_rewrite
 * @since 1.5.0
 */
$GLOBALS['wp_rewrite'] = new WP_Rewrite();

/**
 * WordPress Object
 *
 * @global WP $wp
 * @since 2.0.0
 */
$GLOBALS['wp'] = new WP();

・・・
/* Fires before the theme is loaded. */
do_action( 'setup_theme' );

・・・
//Load the functions for the active theme,for both parent and child theme if applicable.（テーマの functions.php の読み込み）
if ( ! wp_installing() || 'wp-activate.php' === $pagenow ) {
  if ( TEMPLATEPATH !== STYLESHEETPATH && file_exists( STYLESHEETPATH . '/functions.php' ) )
    include( STYLESHEETPATH . '/functions.php' );
  if ( file_exists( TEMPLATEPATH . '/functions.php' ) )
    include( TEMPLATEPATH . '/functions.php' );
}

/* Fires after the theme is loaded */
do_action( 'after_setup_theme' );

・・・
/*
Fires after WordPress has finished loading but before any headers are sent.
Most of WP is loaded at this stage, and the user is authenticated.
WP continues to load on the {@see 'init'} hook that follows (e.g. widgets), and many plugins instantiate themselves on it for all sorts of reasons (e.g. they need a user, a taxonomy, etc.).
If you wish to plug an action once WP is loaded, use the {@see 'wp_loaded'} hook below.
 */
do_action( 'init' );

・・・
/*  This hook is fired once WP, all plugins, and the theme are fully loaded and instantiated. */
do_action( 'wp_loaded' );

function wp( $query_vars = '' ) {
  global $wp, $wp_query, $wp_the_query;  //$wp、$wp_query、$wp_the_query を関数内で使用するためのグローバル宣言
  $wp->main( $query_vars );

  if ( !isset($wp_the_query) )
    $wp_the_query = $wp_query;
  //$wp_the_query がまだ設定されていなければ $wp_query を代入（コピー作成＝バックアップ）
}

//class WP
public function main($query_args = '') {
  $this->init(); //現在のユーザーをセットアップ（Set up the current user）
  $this->parse_request($query_args); //リクエストに基づくクエリ変数のセットアップ（Sets up the query variables based on the request）
  $this->send_headers(); //追加の HTTP ヘッダを送信（Sends additional HTTP headers for caching, content type, etc）
  $this->query_posts(); //クエリ変数に基づくループをセットアップ（Set up the Loop based on the query variables）
  $this->handle_404(); //リクエストされた URL が見つからない場合 404ヘッダをセット
  $this->register_globals(); //グローバル変数のセットアップ

  /**
  * Fires once the WordPress environment has been set up.
  *
  * @since 2.1.0
  *
  * @param WP $this Current WordPress environment instance (passed by reference).
  */
  do_action_ref_array( 'wp', array( &$this ) ); //wp アクションフックの実行
}

//class WP
/**
* Set up the Loop based on the query variables.
* クエリ変数に基づくループをセットアップ
* @since 2.0.0
*
* @global WP_Query $wp_the_query
*/
public function query_posts() {
  global $wp_the_query; //$wp_the_query を関数内で使用するためのグローバル宣言
  $this->build_query_string();
  $wp_the_query->query( $this->query_vars );
}

//class WP
/**
* Sets the query string property based off of the query variable property.
*
* The {@see 'query_string'} filter is deprecated, but still works. Plugins should
* use the {@see 'request'} filter instead.
*
* @since 2.0.0
*/
public function build_query_string() {
  $this->query_string = '';
  foreach ( (array) array_keys( $this->query_vars ) as $wpvar ) {
    if ( '' != $this->query_vars[ $wpvar ] ) {
      $this->query_string .= ( strlen( $this->query_string ) < 1 ) ? '' : '&';
      if ( ! is_scalar( $this->query_vars[ $wpvar ] ) ) { // Discard non-scalars.
        continue;
      }
      $this->query_string .= $wpvar . '=' . rawurlencode( $this->query_vars[ $wpvar ] );
    }
  }

  if ( has_filter( 'query_string' ) ) {  // Don't bother filtering and parsing if no plugins are hooked in.
    /**
     * Filters the query string before parsing.
     *
     * @since 1.5.0
     * @deprecated 2.1.0 Use 'query_vars' or 'request' filters instead.
     *
     * @param string $query_string The query string to modify.
     */
    $this->query_string = apply_filters( 'query_string', $this->query_string );
    parse_str( $this->query_string, $this->query_vars );
  }
}

//class WP_Query
/**
* Sets up the WordPress query by parsing query string.
* クエリ文字列を解析して WordPress のクエリをセットアップ
* @since 1.5.0
*
* @param string|array $query URL query string or array of query arguments.
* @return WP_Post[]|int[] Array of post objects or post IDs.
*/
public function query( $query ) {
  $this->init();
  $this->query = $this->query_vars = wp_parse_args( $query );
  return $this->get_posts();
}

//class WP_Query
/**
* Initiates object properties and sets default values.
*
* @since 1.5.0
*/
public function init() {
  unset( $this->posts );
  unset( $this->query );
  $this->query_vars = array();
  unset( $this->queried_object );
  unset( $this->queried_object_id );
  $this->post_count   = 0;
  $this->current_post = -1;
  $this->in_the_loop  = false;
  unset( $this->request );
  unset( $this->post );
  unset( $this->comments );
  unset( $this->comment );
  $this->comment_count         = 0;
  $this->current_comment       = -1;
  $this->found_posts           = 0;
  $this->max_num_pages         = 0;
  $this->max_num_comment_pages = 0;

  $this->init_query_flags();
}

//class WP_Query
/**
* Retrieves an array of posts based on query variables.
* クエリ変数に基づいた投稿のオブジェクトの配列を取得
*
* There are a few filters and actions that can be used to modify the post database query.
*
* @since 1.5.0
*
* @return WP_Post[]|int[] Array of post objects or post IDs.
*/
public function get_posts() {
  global $wpdb;

  $this->parse_query();

  /**
   * Fires after the query variable object is created, but before the actual query is run.
   *
   * Note: If using conditional tags, use the method versions within the passed instance
   * (e.g. $this->is_main_query() instead of is_main_query()). This is because the functions
   * like is_main_query() test against the global $wp_query instance, not the passed one.
   *
   * @since 2.0.0
   *
   * @param WP_Query $this The WP_Query instance (passed by reference).
   */
  do_action_ref_array( 'pre_get_posts', array( &$this ) );

  // Shorthand.
  $q = &$this->query_vars;

  // Fill again in case pre_get_posts unset some vars.
  $q = $this->fill_query_vars( $q );

  // Parse meta query
  $this->meta_query = new WP_Meta_Query();
  $this->meta_query->parse_query_vars( $q );

  ・・・中略・・・
  ・・・中略・・・
  ・・・中略・・・

  // Ensure that any posts added/modified via one of the filters above are
  // of the type WP_Post and are filtered.
  if ( $this->posts ) {
    $this->post_count = count( $this->posts );

    $this->posts = array_map( 'get_post', $this->posts );

    if ( $q['cache_results'] ) {
      update_post_caches( $this->posts, $post_type, $q['update_post_term_cache'], $q['update_post_meta_cache'] );
    }

    $this->post = reset( $this->posts );
  } else {
    $this->post_count = 0;
    $this->posts      = array();
  }

  if ( $q['lazy_load_term_meta'] ) {
    wp_queue_posts_for_term_meta_lazyload( $this->posts );
  }

  return $this->posts;
}

//class WP
/**
* Set up the WordPress Globals.
*
* The query_vars property will be extracted to the GLOBALS. So care should
* be taken when naming global variables that might interfere with the
* WordPress environment.
*
* @since 2.0.0
*
* @global WP_Query     $wp_query
* @global string       $query_string Query string for the loop.
* @global array        $posts The found posts.
* @global WP_Post|null $post The current post, if available.
* @global string       $request The SQL statement for the request.
* @global int          $more Only set, if single page or post.
* @global int          $single If single page or post. Only set, if single page or post.
* @global WP_User      $authordata Only set, if author archive.
*/
public function register_globals() {
  global $wp_query;

  // Extract updated query vars back into global namespace.
  foreach ( (array) $wp_query->query_vars as $key => $value ) {
    $GLOBALS[ $key ] = $value;
  }

  $GLOBALS['query_string'] = $this->query_string;
  $GLOBALS['posts']        = & $wp_query->posts;
  $GLOBALS['post']         = isset( $wp_query->post ) ? $wp_query->post : null;
  $GLOBALS['request']      = $wp_query->request;

  if ( $wp_query->is_single() || $wp_query->is_page() ) {
    $GLOBALS['more']   = 1;
    $GLOBALS['single'] = 1;
  }

  if ( $wp_query->is_author() && isset( $wp_query->post ) ) {
    $GLOBALS['authordata'] = get_userdata( $wp_query->post->post_author );
  }
}

 /* template-loader.php 一部抜粋 */

  /**
  * Loads the correct template based on the visitor's url
  * リクエストされた URL を基に適切なテンプレートを読み込む
  */

  if ( wp_using_themes() ) {
    /**
    * Fires before determining which template to load.
    * どのテンプレートを使うかを振り分ける前に template_redirect アクションを実行
    */
    do_action( 'template_redirect' );
  }

  ・・・中略・・・

if ( wp_using_themes() ) :
  $template = false;
  if ( is_embed() && $template = get_embed_template() ) :
  elseif ( is_404() && $template = get_404_template() ) :
  elseif ( is_search() && $template = get_search_template() ) :
  elseif ( is_front_page() && $template = get_front_page_template() ) :
  elseif ( is_home() && $template = get_home_template() ) :
  elseif ( is_privacy_policy() && $template = get_privacy_policy_template() ) :
  elseif ( is_post_type_archive() && $template = get_post_type_archive_template() ) :
  elseif ( is_tax() && $template = get_taxonomy_template() ) :
  elseif ( is_attachment() && $template = get_attachment_template() ) :
    remove_filter( 'the_content', 'prepend_attachment' );
  elseif ( is_single() && $template = get_single_template() ) :
  elseif ( is_page() && $template = get_page_template() ) :
  elseif ( is_singular() && $template = get_singular_template() ) :
  elseif ( is_category() && $template = get_category_template() ) :
  elseif ( is_tag() && $template = get_tag_template() ) :
  elseif ( is_author() && $template = get_author_template() ) :
  elseif ( is_date() && $template = get_date_template() ) :
  elseif ( is_archive() && $template = get_archive_template() ) :
  else :
    $template = get_index_template();
  endif;

・・・以下省略・・・