Closes #6833: Refactor to comply with phpstan level 4

inc/Addon/Cloudflare/Subscriber.php

@@ -415,7 +415,7 @@ private function save_cloudflare_auto_settings( $auto_settings, $old_settings )
 		$result = [];
 
 		// Set Cache Level to Aggressive.
-		$cf_cache_level = isset( $cf_old_settings[0] ) && 0 === $auto_settings ? $cf_old_settings[0] : 'aggressive';
+		$cf_cache_level = 0 === $auto_settings ? $cf_old_settings[0] : 'aggressive';
 		$result[]       = $this->save_cache_level( $cf_cache_level );
 
 		// Deactivate Rocket Loader to prevent conflicts.

inc/Addon/WebP/Subscriber.php

@@ -38,7 +38,7 @@ class Subscriber extends AbstractWebp implements Subscriber_Interface {
 	/**
 	 * \WP_Filesystem_Direct instance.
 	 *
-	 * @var \WP_Filesystem_Direct
+	 * @var null|\WP_Filesystem_Direct
 	 */
 	private $filesystem;
 
@@ -58,11 +58,11 @@ public function __construct( Options_Data $options_data, Options $options_api, C
 		$this->options_data = $options_data;
 		$this->options_api  = $options_api;
 
-		if ( ! isset( $server ) && ! empty( $_SERVER ) && is_array( $_SERVER ) ) {
+		if ( ! isset( $server ) && ! empty( $_SERVER ) ) {
 			$server = $_SERVER;
 		}
 
-		$this->server = $server && is_array( $server ) ? $server : [];
+		$this->server = $server ?: [];
 	}
 
 	/**
@@ -202,8 +202,8 @@ public function sync_webp_cache_with_third_party_plugins() {
 	 * @param array $requests Requests to make.
 	 * @return array
 	 */
-	public function add_accept_header( $requests ) {
-		if ( ! is_array( $requests ) || ! $this->options_data->get( 'cache_webp', 0 ) ) {
+	public function add_accept_header( array $requests ) {
+		if ( ! $this->options_data->get( 'cache_webp', 0 ) ) {
 			return $requests;
 		}
 
@@ -214,7 +214,7 @@ function ( $request ) {
 				return $request;
 			},
 			$requests
-			);
+		);
 	}
 
 	/**

inc/Dependencies/Database/Base.php

@@ -281,7 +281,7 @@ protected function set_vars( $args = array() ) {
 	 *
 	 * @since 1.0.0
 	 *
-	 * @return \wpdb Database interface, or False if not set
+	 * @return \wpdb|false Database interface, or False if not set
 	 */
 	protected function get_db() {
 

inc/Engine/Admin/Beacon/Beacon.php

@@ -111,7 +111,7 @@ public function insert_script() {
 	 * @return string
 	 */
 	private function get_user_locale() {
-		if ( ! isset( $this->locale ) ) {
+		if ( empty( $this->locale ) ) {
 			$this->locale = current( array_slice( explode( '_', get_user_locale() ), 0, 1 ) );
 		}
 
@@ -122,7 +122,7 @@ private function get_user_locale() {
 		 *
 		 * @param string $locale The locale ID.
 		 */
-		return apply_filters( 'rocket_beacon_locale', $this->locale );
+		return wpm_apply_filters_typed( 'string', 'rocket_beacon_locale', $this->locale );
 	}
 
 	/**

inc/Engine/Admin/Database/Optimization.php

@@ -56,7 +56,7 @@ public function get_options() {
 	 * @param array $options WP Rocket Database options.
 	 */
 	public function process_handler( $options ) {
-		if ( method_exists( $this->process, 'cancel_process' ) ) {
+		if ( method_exists( $this->process, 'cancel_process' ) ) { // @phpstan-ignore-line
 			$this->process->cancel_process();
 		}
 

inc/Engine/Admin/Metaboxes/PostEditOptionsSubscriber.php

@@ -104,11 +104,7 @@ public function display_metabox() {
 		 *
 		 * @param string[] $original_fields Metaboxes fields.
 		 */
-		$fields = apply_filters( 'rocket_meta_boxes_fields', $original_fields );
-
-		if ( ! is_array( $fields ) ) {
-			$fields = $original_fields;
-		}
+		$fields = wpm_apply_filters_typed( 'array', 'rocket_meta_boxes_fields', $original_fields );
 
 		$fields_attributes = [];
 
@@ -179,11 +175,7 @@ public function save_metabox_options() {
 		 *
 		 * @param string[] $original_fields Metaboxes fields.
 		 */
-		$fields = apply_filters( 'rocket_meta_boxes_fields', $original_fields );
-
-		if ( ! is_array( $fields ) ) {
-			$fields = $original_fields;
-		}
+		$fields = wpm_apply_filters_typed( 'array', 'rocket_meta_boxes_fields', $original_fields );
 
 		$fields = array_keys( $fields );
 

inc/Engine/Admin/Settings/Page.php

@@ -1172,7 +1172,7 @@ private function advanced_cache_section() {
 			$ecommerce_plugin = _x( 'iThemes Exchange', 'plugin name', 'rocket' );
 		} elseif ( defined( 'JIGOSHOP_VERSION' ) && function_exists( 'jigoshop_get_page_id' ) ) {
 			$ecommerce_plugin = _x( 'Jigoshop', 'plugin name', 'rocket' );
-		} elseif ( defined( 'WPSHOP_VERSION' ) && class_exists( 'wpshop_tools' ) && method_exists( 'wpshop_tools', 'get_page_id' ) ) {
+		} elseif ( defined( 'WPSHOP_VERSION' ) && class_exists( 'wpshop_tools' ) && method_exists( 'wpshop_tools', 'get_page_id' ) ) { // @phpstan-ignore-line
 			$ecommerce_plugin = _x( 'WP-Shop', 'plugin name', 'rocket' );
 		}
 
@@ -1519,11 +1519,7 @@ private function cdn_section() {
 		 *
 		 * @param array $addons Array of addons.
 		 */
-		$addons = apply_filters( 'rocket_cdn_helper_addons', [] );
-
-		if ( ! is_array( $addons ) ) {
-			$addons = [];
-		}
+		$addons = wpm_apply_filters_typed( 'array', 'rocket_cdn_helper_addons', [] );
 
 		$addons = array_unique( $addons );
 
@@ -2107,8 +2103,8 @@ private function hidden_fields() {
 	 * @param  string $tag_name Name of the HTML tag that will wrap each element of the list.
 	 * @return array
 	 */
-	private function sanitize_and_format_list( $list, $tag_name = 'strong' ) { // phpcs:ignore Universal.NamingConventions.NoReservedKeywordParameterNames.listFound
-		if ( ! is_array( $list ) || empty( $list ) ) {
+	private function sanitize_and_format_list( array $list, $tag_name = 'strong' ) { // phpcs:ignore Universal.NamingConventions.NoReservedKeywordParameterNames.listFound
+		if ( empty( $list ) ) {
 			return [];
 		}
 
@@ -2180,7 +2176,7 @@ public function enable_mobile_cache(): void {
 
 		if ( ! current_user_can( 'rocket_manage_options' ) ) {
 			wp_send_json_error();
-			return;
+			return; // @phpstan-ignore-line
 		}
 
 		$this->options->set( 'cache_mobile', 1 );

inc/Engine/Admin/Settings/Render.php

@@ -106,10 +106,6 @@ function ( array $item ) use ( $default ) {
 	 * @since 3.0
 	 */
 	public function render_form_sections() {
-		if ( ! isset( $this->settings ) ) {
-			return;
-		}
-
 		foreach ( $this->settings as $id => $args ) {
 			$default = [
 				'title'            => '',

inc/Engine/Admin/Settings/Settings.php

@@ -333,7 +333,9 @@
 
 		$input['automatic_cleanup_frequency'] = isset( $input['automatic_cleanup_frequency'], $cleanup_frequencies[ $input['automatic_cleanup_frequency'] ] ) ? $input['automatic_cleanup_frequency'] : $this->options->get( 'automatic_cleanup_frequency' );
 
-		if ( 1 !== $input['schedule_automatic_cleanup'] && ( 'daily' !== $input['automatic_cleanup_frequency'] || 'weekly' !== $input['automatic_cleanup_frequency'] || 'monthly' !== $input['automatic_cleanup_frequency'] ) ) {
+		$allowed_frequencies = [ 'daily', 'weekly', 'monthly' ];
+
+		if ( 1 !== $input['schedule_automatic_cleanup'] && ! in_array( $input['automatic_cleanup_frequency'], $allowed_frequencies, true ) ) {
 			$input['automatic_cleanup_frequency'] = $this->options->get( 'automatic_cleanup_frequency' );
 		}
 
@@ -554,11 +556,7 @@
 	 * @param string $file URL or path to a font file.
 	 * @return string|bool
 	 */
-	private function sanitize_font( $file ) {
-		if ( ! is_string( $file ) ) {
-			return false;
-		}
-
+	private function sanitize_font( string $file ) {
 		$file = trim( $file );
 
 		if ( empty( $file ) ) {
@@ -604,10 +602,6 @@
 	 * @return array
 	 */
 	private function get_hosts() {
-		if ( isset( $this->hosts ) ) {
-			return $this->hosts;
-		}
-
 		$urls   = (array) $this->options->get( 'cdn_cnames', [] );
 		$urls[] = home_url();
 		$urls   = array_map( 'rocket_add_url_protocol', $urls );

inc/Engine/CDN/RocketCDN/DataManagerSubscriber.php

@@ -63,30 +63,22 @@ public function update_user_token() {
 
 		if ( ! current_user_can( 'rocket_manage_options' ) ) {
 			wp_send_json_error( 'unauthorized_user' );
-
-			return;
 		}
 
 		if ( empty( $_POST['value'] ) ) {
 			delete_option( 'rocketcdn_user_token' );
 
 			wp_send_json_success( 'user_token_deleted' );
-
-			return;
 		}
 
 		if ( ! is_string( $_POST['value'] ) ) {
 			wp_send_json_error( 'invalid_token' );
-
-			return;
 		}
 
 		$token = sanitize_key( $_POST['value'] );
 
 		if ( 40 !== strlen( $token ) ) {
 			wp_send_json_error( 'invalid_token_length' );
-
-			return;
 		}
 
 		update_option( 'rocketcdn_user_token', $token );
@@ -112,16 +104,12 @@ public function enable() {
 			$data['message'] = 'unauthorized_user';
 
 			wp_send_json_error( $data );
-
-			return;
 		}
 
 		if ( empty( $_POST['cdn_url'] ) ) {
 			$data['message'] = 'cdn_url_empty';
 
 			wp_send_json_error( $data );
-
-			return;
 		}
 
 		$cdn_url = filter_var( wp_unslash( $_POST['cdn_url'] ), FILTER_VALIDATE_URL );
@@ -130,8 +118,6 @@ public function enable() {
 			$data['message'] = 'cdn_url_invalid_format';
 
 			wp_send_json_error( $data );
-
-			return;
 		}
 
 		$this->cdn_options->enable( esc_url_raw( $cdn_url ) );
@@ -164,8 +150,6 @@ public function disable() {
 			$data['message'] = 'unauthorized_user';
 
 			wp_send_json_error( $data );
-
-			return;
 		}
 
 		$this->cdn_options->disable();
@@ -234,14 +218,10 @@ public function get_process_status() {
 
 		if ( ! current_user_can( 'rocket_manage_options' ) ) {
 			wp_send_json_error();
-
-			return;
 		}
 
 		if ( get_option( 'rocketcdn_process' ) ) {
 			wp_send_json_success();
-
-			return;
 		}
 
 		wp_send_json_error();
@@ -285,13 +265,11 @@ public function validate_token_cname() {
 		if ( ! current_user_can( 'rocket_manage_options' ) ) {
 			$data['message'] = 'unauthorized_user';
 			wp_send_json_error( $data );
-			return;
 		}
 
 		if ( empty( $_POST['cdn_url'] ) || empty( $_POST['cdn_token'] ) ) {
 			$data['message'] = 'cdn_values_empty';
 			wp_send_json_error( $data );
-			return;
 		}
 
 		$token   = sanitize_key( $_POST['cdn_token'] );
@@ -300,13 +278,11 @@ public function validate_token_cname() {
 		if ( ! $cdn_url ) {
 			$data['message'] = 'cdn_url_invalid_format';
 			wp_send_json_error( $data );
-			return;
 		}
 
 		if ( 40 !== strlen( $token ) ) {
 			$data['message'] = 'invalid_token_length';
 			wp_send_json_error( $data );
-			return;
 		}
 
 		$current_token = get_option( 'rocketcdn_user_token' );
@@ -315,7 +291,6 @@ public function validate_token_cname() {
 		if ( ! empty( $current_token ) ) {
 			$data['message'] = 'token_already_set';
 			wp_send_json_error( $data );
-			return;
 		}
 
 		update_option( 'rocketcdn_user_token', $token );

inc/Engine/CDN/RocketCDN/NoticesSubscriber.php

@@ -167,8 +167,6 @@ public function dismiss_notice() {
 
 		if ( ! current_user_can( 'rocket_manage_options' ) ) {
 			wp_send_json_error( 'no permissions' );
-
-			return;
 		}
 
 		update_user_meta( get_current_user_id(), 'rocketcdn_dismiss_notice', true );
@@ -284,14 +282,10 @@ public function toggle_cta() {
 
 		if ( ! current_user_can( 'rocket_manage_options' ) ) {
 			wp_send_json_error( 'no permissions' );
-
-			return;
 		}
 
 		if ( ! isset( $_POST['status'] ) ) {
 			wp_send_json_error( 'missing status' );
-
-			return;
 		}
 
 		if ( 'big' === $_POST['status'] ) {

inc/Engine/Cache/Purge.php

@@ -57,11 +57,7 @@ public function purge_dates_archives( $post ) {
 	 * @param boolean $pagination Purge also pagination.
 	 * @return void
 	 */
-	public function purge_url( $url, $pagination = false ) {
-		if ( ! is_string( $url ) ) {
-			return;
-		}
-
+	public function purge_url( string $url, $pagination = false ) {
 		global $wp_rewrite;
 
 		$parsed_url = $this->parse_url( $url );

inc/Engine/Cache/PurgeExpired/PurgeExpiredCache.php

@@ -23,7 +23,7 @@ class PurgeExpiredCache {
 	 *
 	 * @since  3.4
 	 *
-	 * @var \WP_Filesystem_Direct
+	 * @var null|\WP_Filesystem_Direct
 	 */
 	private $filesystem;
 
@@ -60,7 +60,7 @@ public function purge_expired_files( $lifespan ) {
 		 * @param array $urls           URLs that will be searched for old cache files.
 		 * @param int   $file_age_limit Timestamp of the maximum age files must have.
 		 */
-		$urls = apply_filters( 'rocket_automatic_cache_purge_urls', $urls, $file_age_limit );
+		$urls = wpm_apply_filters_typed( 'array', 'rocket_automatic_cache_purge_urls', $urls, $file_age_limit );
 
 		if ( ! is_array( $urls ) ) {
 			// I saw what you did ಠ_ಠ.
@@ -380,8 +380,8 @@ private function is_dir_empty( $dir_path ) {
 	 *
 	 * @since 3.8
 	 *
-	 * @param int $old_lifespan      Old value in minutes.
-	 * @param int $old_lifespan_unit Old value of unit.
+	 * @param int    $old_lifespan      Old value in minutes.
+	 * @param string $old_lifespan_unit Old value of unit.
 	 *
 	 * @return void
 	 */

inc/Engine/Common/Database/Queries/AbstractQuery.php

@@ -45,7 +45,7 @@ public function get_row( string $url, bool $is_mobile = false ) {
 	 *
 	 * @param int $row_id DB Row ID.
 	 *
-	 * @return array|false
+	 * @return object|array|false false if no row found, array or object if row found.
 	 */
 	public function get_row_by_id( int $row_id ) {
 		if ( ! self::$table_exists && ! $this->table_exists() ) {