Generate WordPress dummy posts with content and post thumbnail

WPSSDummy.php

<?php

/**
 * Class WPSSDummy
 *
 * Generate dummy posts, see parameters of loripsum api:
 *
 * (integer) - The number of paragraphs to generate.
 * short, medium, long, verylong - The average length of a paragraph.
 * decorate - Add bold, italic and marked text.
 * link - Add links.
 * ul - Add unordered lists.
 * ol - Add numbered lists.
 * dl - Add description lists.
 * bq - Add blockquotes.
 * code - Add code samples.
 * headers - Add headers.
 * allcaps - Use ALL CAPS.
 * prude - Prude version.
 * plaintext - Return plain text, no HTML.
 */
class WPSSDummy {

	/**
	 * Posts limit to generate
	 *
	 * @var int
	 */
	public static int $posts_quantity = 10;

	/**
	 * Define post type to dummy posts
	 *
	 * @var string
	 */
	public static string $post_type = 'post';

	/**
	 * Define default post author
	 *
	 * @var int|null
	 */
	public static ?int $post_author = null;

	/**
	 * Define days interval for each post
	 *
	 * @var int
	 */
	public static int $days_interval = 0;

	/**
	 * Define hours interval for each post
	 *
	 * @var int
	 */
	public static int $hour_interval = 1;

	/**
	 * Define default post status
	 *
	 * @var string
	 */
	public static string $post_status = 'publish';

	/**
	 * Define content api
	 *
	 * @var string
	 */
	public static string $content_api = 'http://loripsum.net/api/';

	/**
	 * Default content length
	 *
	 * @var int
	 */
	public static int $content_length = 10;

	/**
	 * Set thumbnail image api
	 *
	 * @var string
	 */
	public static string $thumbnail_api = 'http://picsum.photos/';

	/**
	 * Define image width
	 *
	 * @var int
	 */
	public static int $thumb_width = 880;

	/**
	 * Define image height
	 *
	 * @var int
	 */
	public static int $thumb_height = 660;

	public function __construct() {
		self::$content_api   = self::$content_api . self::$content_length . '/medium/decorate/link';
		self::$thumbnail_api = self::$thumbnail_api . self::$thumb_width . '/' . self::$thumb_height;
		if( is_null(self::$post_author) ):
			self::$post_author = self::wpss_assign_post_to_user();
		endif;
	}

	/**
	 * Make post types
	 */
	public function wpss_make_posts(): void {
		$output = __('Starting post create...<br>', 'wpss');
		for( $posts = 0; $posts < self::$posts_quantity; $posts++ ):
			if( self::$days_interval > 0 ):
				self::$days_interval++;
			endif;
			if( self::$hour_interval > 0 ):
				self::$hour_interval++;
			endif;
			$output .= self::wpss_insert_posts();
		endfor;
		$output .= __('Dummy posts created successfully!', 'wpss');
		echo $output;
	}

	/**
	 * Insert singular post
	 *
	 * @return string
	 */
	private function wpss_insert_posts(): string {
		$post_id = wp_insert_post(self::wpss_post_args());
		self::wpss_set_thumbnail($post_id, basename(get_permalink($post_id)));
		return sprintf(__('The post <strong>%s</strong> was created successfully<br>'), get_the_title($post_id));
	}

	/**
	 * Default post args
	 *
	 * @return array
	 */
	private function wpss_post_args(): array {
		return [
			'post_author'   => self::$post_author,
			'post_date'     => self::wpss_posts_date_interval(),
			'post_date_gmt' => self::wpss_posts_date_interval(true),
			'post_title'    => self::wpss_generate_title(),
			'post_content'  => self::wpss_generate_content(),
			'post_excerpt'  => self::wpss_generate_excerpt(),
			'post_status'   => self::$post_status,
			'post_type'     => self::$post_type,
		];
	}

	/**
	 * Generate post title
	 *
	 * @return string
	 */
	private function wpss_generate_title(): string {
		$title = wp_remote_retrieve_body(self::wpss_remote_get(self::$content_api));
		$title = str_replace('Lorem ipsum dolor sit amet, consectetur adipiscing elit.', '', $title);
		$title = explode(' ', sanitize_text_field($title));
		$title = array_slice($title, 0, rand(6, 12));
		return implode(' ', (array)$title);
	}

	/**
	 * Generate post excerpt
	 *
	 * @param int $limit limit of words for excerpt
	 *
	 * @return string
	 */
	private function wpss_generate_excerpt(int $limit = 100): string {
		$content = sanitize_text_field(self::wpss_generate_content());
		$content = explode(' ', $content);
		$content = array_slice($content, 0, $limit);
		return implode(' ', (array)$content);
	}

	/**
	 * Generate post content
	 *
	 * @return string
	 */
	private function wpss_generate_content(): string {
		$content = self::wpss_remote_get(self::$content_api);
		return wp_remote_retrieve_body($content);
	}

	/**
	 * Define post date
	 *
	 * @param bool $gmt define if is gmt date
	 *
	 * @return string
	 */
	private function wpss_posts_date_interval(bool $gmt = false): string {
		$days          = self::$days_interval;
		$hour          = self::$hour_interval;
		$generate_date = strtotime(current_time('Y-m-d H:i:s', $gmt) . "-$days days -$hour hour");
		return date('Y-m-d H:i:s', $generate_date);
	}

	/**
	 * Define rand author post
	 *
	 * @return int
	 */
	private function wpss_assign_post_to_user(): int {
		$args   = [ 'role' => 'administrator' ];
		$users  = new WP_User_Query($args);
		$author = [];
		foreach( $users->get_results() as $user ):
			$author[$user->ID] = $user->display_name;
		endforeach;

		return array_rand($author);
	}

	/**
	 * Set automatic post thumbnail
	 *
	 * @param int $post_id
	 * @param string $image_name
	 */
	private function wpss_set_thumbnail(int $post_id, string $image_name): void {
		$get_thumbnail = self::wpss_remote_get(self::$thumbnail_api);
		if( !empty($get_thumbnail) ) :
			$the_thumbnail = wp_upload_bits("{$image_name}.jpg", null, wp_remote_retrieve_body($get_thumbnail));
			$mime          = wp_remote_retrieve_header($get_thumbnail, 'content-type');
			$set_thumbnail = [
				'post_title'     => $image_name,
				'guid'           => $the_thumbnail['url'],
				'post_status'    => 'inherit',
				'post_mime_type' => $mime,
			];
			$thumbnail_id  = wp_insert_attachment($set_thumbnail, $the_thumbnail['file'], $post_id);
			include_once ABSPATH . 'wp-admin/includes/image.php';
			$thumbnail_data = wp_generate_attachment_metadata($thumbnail_id, $the_thumbnail['file']);
			wp_update_attachment_metadata($thumbnail_id, $thumbnail_data);
			set_post_thumbnail($post_id, $thumbnail_id);
		endif;
	}

	/**
	 * @param string $url
	 *
	 * @return array
	 */
	private function wpss_remote_get(string $url): ?array {
		$response = wp_remote_get($url, [ 'timeout' => 120, 'sslverify' => false ]);
		if( wp_remote_retrieve_response_code($response) !== 200 ):
			return [];
		endif;
		return $response;
	}
}

/**
 * Usage sample
 */
//$posts = new WPSSDummy();
//$posts->wpss_make_posts();