PHP MySQL and Queues, Table Locking, Reader/Writer Problem?

MySQL's default locking will ensure that no "half-written" rows are fetched. As far as "caching locally", it seems like all that means in your scenario is reading them out of the database into a local PHP data structure like an array.

You can see about MySQL locking here: Locking in MySQL. Remeber unlock table after finishing write data.

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