*/ public function groups(): array { return array( 'amp' => __( 'AMP', 'duracelltomi-google-tag-manager' ), ); } /** * Field definitions. * * @return Field[] */ public function fields(): array { return array( new Field( key: GTM4WP_OPTION_INTEGRATE_AMPID, type: Field::TYPE_TEXT, default_value: '', label: __( "Google Tag Manager 'AMP' Container ID", 'duracelltomi-google-tag-manager' ), description: sprintf( /* translators: 1: opening anchor tag for a link pointing to the official GTM help center article about the AMP container snippet 2: Closing anchor tag. */ esc_html__( 'Enter a comma separated list of Google Tag Manager container IDs that you would like to use on your site. This plugin will add the %1$sAMP GTM snippet%2$s to your AMP pages.', 'duracelltomi-google-tag-manager' ), '', '' ), group: 'amp', sanitizer: static function ( $value ) { // Field::to_string() keeps the cast warning-free on non-scalar // import values (a custom sanitizer replaces the type-defensive // default in Field::sanitize(), it does not run in front of it). $value = trim( Field::to_string( $value ) ); if ( '' === $value ) { return ''; } foreach ( explode( ',', $value ) as $one_amp_id ) { if ( ! preg_match( '/^GTM-[A-Z0-9]+$/', $one_amp_id ) ) { return new \WP_Error( 'gtm4wp_invalid_amp_id', __( 'Invalid AMP Google Tag Manager Container ID. Valid ID format: GTM-XXXXX. Use comma without additional space (,) to enter more than one ID.', 'duracelltomi-google-tag-manager' ) ); } } return $value; }, doc: self::DOC_PAGE ), ); } /** * The AMP module is always available; it only acts on AMP pages. * * @return string */ public function unavailable_message(): string { return ''; } }