$data * @psalm-pure */ public static function encode(array $data, ?int $options = null): string { if ($options === null) { $options = self::DEFAULT; } $result = json_encode($data, $options); if ($result == false) { $result = json_encode(self::scrub($data), $options); } if ($result === false) { /** @psalm-suppress ImpureFunctionCall */ throw new RuntimeException('Cannot create JSON string: '.json_last_error_msg()); } return $result; } /** @psalm-pure */ private static function scrub(array $data): array { /** @psalm-suppress ImpureFunctionCall */ array_walk_recursive( $data, /** * @psalm-pure * @param mixed $value */ function (&$value): void { if (is_string($value)) { $value = preg_replace_callback( self::INVALID_UTF_REGEXP, static fn(array $matches): string => '', $value, ); } }, ); return $data; } }