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// Check & create new post/page programmatically
add_action('init', 'create_new_post_programmatically');
function create_new_post_programmatically() {
	global $wpdb;

	$postName  = 'Coming Soon';				// Post Title
	$postContent = '[coming-soon]';			// Post Content

	// Check if post's slug already exists
	if($wpdb->get_row("SELECT post_name FROM wp_posts WHERE post_name = '" . sanitize_title( $postName ) . "'", 'ARRAY_A')) {
		$is_slug_exists = TRUE;
	} else {
		$is_slug_exists = FALSE;
	}


	if ( is_admin()){

		// Check if post' Title already exits
	    $post_obj = get_page_by_title($postName);

	    // Setup post's details
	    $sitemap_page = array(
		    'post_type' => 'page',
		    'post_title' => $postName,
		    'post_content' => $postContent,
		    'post_status' => 'publish',
		    'post_author' => 1,
	    );

	    // Create a new post, If post's ID  and post's slug not exists
	    if(!isset($post_obj->ID) && $is_slug_exists == FALSE){
	        $page_id = wp_insert_post($sitemap_page);
	    }
    }
}