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Running upgrade.php – what exactly does it do?

  • I’m thinking of upgrading a 1.5.2 to 1.5.3 and I read somewhere here to run /wp-admin/upgrade.php after the old files have been replaced. In fact I think the comment was “it does no harm to run upgrade.php” at any time.

    What does upgrade.php actually do, and is there any risk in running the file at any time, even if an upgrade hasn’t been done?

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