从MySQL-> PostGres迁移：在MySQL中存储PHP对象的最佳方式，在PostGres中检索？

I have a a MySQL database that stores PHP objects in serialized format to a BLOB field. I'm moving this database from MySQL -> PostGres.

So far I have found no way to move those PHP objects to PostGres. Saving the objects serialized to a MySQL field of type BLOB or MySQL LongText, and importing into PostGres Text or ByteA, apparently fails to bring the data over when imported.

I'm happy to write special-purpose code to store the PHP objects in any way that will work. What's a good way to store them in MySQL so as to import them into PostGres?

Note: Per request of StackOverflow, this question is different from Storing large JSON - binary or text, because that question does not reference postgres.

A data transfer tool (Valentina Pro), copied the mySQL BLOB fields to PostGres ByteA fields. This code retrieved the serialized string from the contents of this field:

$serializedString = pg_unescape_bytea($contentsOfPostGresByteAField);

Thanks to Sergey Pashkov for the tip!