address utf8 / utf8mb4 issue on table sessions … #25
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when session data with 4 byte UTF-8 characters is saved into mysql 3-byte ‚utf8‘ charset data field. There are two options: - APP_ DB_USE_UTF8MB4_ON_UTF8 uses SET NAMES 'utf8mb4' COLLATE 'utf8mb4_general_ci‘ - APP_DB_TR_UTF8_TO_UTF8MB4 + has to be used in addition to APP_DB_USE_UTF8MB4_ON_UTF8 + could auto-convert charset and collates to utf8mb4 - but is restricted yet to only the session table (due the 768 byte limit of indexes, which get exceeded on other system tables). + This option doesn’t help on a already created session table, you have to convert it manually.
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when session data with 4 byte UTF-8 characters is saved into mysql 3-byte ‚utf8‘ charset data field.
There are two options:
SET NAMES 'utf8mb4' COLLATE 'utf8mb4_general_ci‘