Do portable SQL systems exist that store the database in a file and are not the application for which the port is open? I prefer that such a system works on php, well, or is an extension.

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    This means that you need an "in-proc file-based database" or "embedded database. See SQLite and SQL Server Compact Edition. - nzeemin

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This is the default used in android. https://ru.wikipedia.org/wiki/SQLite