Akismet check for Quform

QuForm.php

	/**
	 * Check Quform data with Akismet.
	 *
	 * @param array|mixed $result Result.
	 * @param Quform_Form $form   Form.
	 *
	 * @return array
	 * @noinspection PhpUndefinedFunctionInspection
	 * @noinspection PhpPossiblePolymorphicInvocationInspection
	 */
	public function akismet_check( array $result, Quform_Form $form ): array {
		$result = (array) $result;

		$success = empty( $result ) || 'success' === ( $result['type'] ?? '' );

		if ( ! $success ) {
			return $result;
		}

		if ( ! function_exists( 'akismet_http_post' ) ) {
			return $result;
		}

		// Collect all values into one content line.
		$values  = $form->getValues();
		$content = '';

		// Add form data.
		foreach ( $values as $key => $value ) {
			$element = $form->getElement( $key );

			if ( ! $element ) {
				continue;
			}

			$label = trim( $element->config()['label'] ?? '' );

			if ( ! $label ) {
				continue;
			}

			// Do not check fields having any validators except required.
			if ( array_diff( array_keys( $element->getValidators() ), [ 'Quform_Validator_Required' ] ) ) {
				continue;
			}

			$content .= $label . ': ' . $value . "\n";
		}

		$user_agent = isset( $_SERVER['HTTP_USER_AGENT'] )
			? sanitize_text_field( wp_unslash( $_SERVER['HTTP_USER_AGENT'] ) )
			: '';
		$referrer   = isset( $_SERVER['HTTP_REFERER'] )
			? sanitize_url( wp_unslash( $_SERVER['HTTP_REFERER'] ) )
			: '';

		// Preparing Akismet data.
		$akismet_data = [
			'user_ip'         => $this->get_user_ip(),
			'user_agent'      => $user_agent,
			'referrer'        => $referrer,
			'blog'            => get_option( 'home' ),
			'blog_lang'       => get_locale(),
			'blog_charset'    => get_bloginfo( 'charset' ),
			'permalink'       => get_permalink(),
			'comment_type'    => 'contact-form',
			'comment_content' => trim( $content ),
		];

		// Check data with Akismet.
		$response = Akismet::http_post( Akismet::build_query( $akismet_data ), 'comment-check' );

		if ( isset( $response[1] ) && trim( $response[1] ) === 'true' ) {
			// Spam found - do not save/submit data.
			return $this->error( __( 'Spam found', 'wtei' ) );
		}

		return [];
	}

		add_action( 'quform_post_process', [ $this, 'akismet_check' ], 10, 2 );