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WordPress fix Site DOwn after 4.9.2 Upgrade

Discussion in 'Misc WordPress Requests' started by mjb566, Jan 17, 2018.

  1. mjb566


    Site DOwn after 4.9.2 Upgrade, by mjb566

    4.9.2 auto-installed last night and broke my site. I have managed to get it working by replacing wp-db.php with the version from 4.9.1

    If I re-install wp-db.php from 4.9.2 the site breaks with the error message Warning: preg_match(): Compilation failed: unrecognized character after (?< at offset 4 in /web1/user/website/wp-includes/wp-db.php on line 1657

    The line referred (1657) to matches line 1664 in ver 4.9.1 but otherwise is the same in both versions.

    Any ideas why the wp-db.php file from 4.9.2 is breaking the site whilst 4.9.1 doesn’t?

    Site DOwn after 4.9.2 Upgrade

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