SerializedValueContainer.php

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<?php

class SerializedValueContainer {
    const SCHEMA = '__svc_schema__';
    const SCHEMA_UNIFIED = 'DAAIDgoKAQw'; // 64 bit UID
    const SCHEMA_SEGMENTED = 'CAYCDAgCDw4'; // 64 bit UID

    const UNIFIED_DATA = '__data__';
    const SEGMENTED_HASHES = '__hashes__';

    public static function newUnified( $serialized ) {
        return (object)[
            self::SCHEMA => self::SCHEMA_UNIFIED,
            self::UNIFIED_DATA => $serialized
        ];
    }

    public static function newSegmented( array $segmentHashList ) {
        return (object)[
            self::SCHEMA => self::SCHEMA_SEGMENTED,
            self::SEGMENTED_HASHES => $segmentHashList
        ];
    }

    public static function isUnified( $value ) {
        return self::instanceOf( $value, self::SCHEMA_UNIFIED );
    }

    public static function isSegmented( $value ) {
        return self::instanceOf( $value, self::SCHEMA_SEGMENTED );
    }

    private static function instanceOf( $value, $schema ) {
        return (
            $value instanceof stdClass &&
            property_exists( $value, self::SCHEMA ) &&
            $value->{self::SCHEMA} === $schema
        );
    }
}