Implement FROM_BASE64() and TO_BASE64() MySQL functions#326
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These functions allow encoding and decoding base64 data in SQL queries, matching the behavior of their MySQL counterparts. They are registered as SQLite user-defined functions backed by PHP's base64_encode() and base64_decode(), so both the legacy and AST-based drivers can use them. FROM_BASE64() returns NULL for NULL or invalid base64 input. TO_BASE64() returns NULL for NULL input.
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## Summary
- Registers `FROM_BASE64()` and `TO_BASE64()` as SQLite user-defined
functions when creating a SQLite target connection for db-apply
- `MySQLDumpProducer` encodes all non-numeric values as
`FROM_BASE64('...')` in SQL dumps — without these function definitions,
SQLite imports fail because SQLite has no built-in base64 support
- Both functions handle NULL inputs correctly
- We'll be able to remove those functions once
WordPress/sqlite-database-integration#326 gets
released
## Test plan
- [ ] Verify existing e2e test `import-38-db-apply-sqlite-target` still
passes
- [ ] Verify unit tests pass (`composer test:fast` — confirmed locally,
432 tests green)
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Summary
This adds support for MySQL's
FROM_BASE64()andTO_BASE64()functions, allowing SQL queries to encode and decode base64 data.Both functions are implemented as SQLite user-defined functions backed by PHP's
base64_encode()andbase64_decode(). Because they're registered throughWP_SQLite_PDO_User_Defined_Functions::register_for(), they work with both the legacy and AST-based drivers automatically.FROM_BASE64()returnsNULLforNULLor invalid base64 input.TO_BASE64()returnsNULLforNULLinput.Test plan
composer run test -- --filter 'testFromBase64|testToBase64'