A class for create new pages in WordPress theme or plugin. Code example

This is a PHP class named Plugin_Install that has a private static method named create_pages()
that creates new pages for a WordPress plugin. The method retrieves an array of page data from the new_pages filter and iterates through each item in the array. Each item represents a WordPress page that will be created if it doesn’t already exist.

The method also checks whether the page exists by calling the isset_plugin_page() function. If the page doesn’t exist, the method calls the create_plugin_page_if_need() function to create the page with the given title, content, and name. Finally, each created page’s data is stored in the $site_options array.

class Plugin_Install {

	private static function create_pages() {
		//we will write each new page in a variable so as not to recreate the pages. Can use wordress options
		global $site_options;

		$pages = apply_filters( 'new_pages', array(
			'account' => array(
				'name' => 'account',
				'title' => __( 'Personal cabinet', 'text-domain' ),
				'content' => 'Some content'
			),
			'Feed' => array(
				'name' => 'user-feed',
				'title' => __( 'FEED', 'text-domain' ),
				'content' => 'Some content'
			),
			'all_users' => array(
				'name' => 'users',
				'title' => __( 'Users', 'wp-recall' ),
				'content' => 'Some content'
			),
		) );

		foreach ( $pages as $key => $page ) {

			if ( is_array( $page ) ) {

				if ( ! isset_plugin_page( $key ) ) {
					//write new option
					$site_options[ $key ] = create_plugin_page_if_need( $key, [ 
						'post_title' => $page['title'],
						'post_content' => $page['content'],
						'post_name' => $page['name'],
					] );
				}

			}
		}
	}
}

function create_plugin_page_if_need( $page_id, $args ) {
	if ( ! isset_plugin_page( $page_id ) ) {
		return create_plugin_page( $page_id, $args );
	}

	return false;
}

function isset_plugin_page( $page_id ) {
	return get_plugin_page( $page_id ) ? true : false;
}

function get_plugin_page( $page_id ) {

	$plugin_pages = get_site_option( 'plugin_pages' );

	if ( ! isset( $plugin_pages[ $page_id ] ) ) {
		return false;
	}

	global $wpdb;
	$table  = $wpdb->prefix . 'posts';
	$result = $wpdb->get_var( "SELECT ID FROM {$table} WHERE ID = {$plugin_pages[ $page_id ]} AND post_status = 'publish'" );

	return $result;
}

function create_plugin_page( $page_id, $args ) {
	global $user_ID;

	$ID = wp_insert_post( wp_parse_args( $args, array(
		'post_status' => 'publish',
		'post_author' => $user_ID,
		'post_type' => 'page'
	) ) );

	if ( ! $ID ) {
		return false;
	}

	$plugin_pages = get_site_option( 'plugin_pages' );

	$plugin_pages[ $page_id ] = $ID;

	update_site_option( 'plugin_pages', $plugin_pages );

	return $ID;
}

Plugin_Install::create_pages();