[wp-trac] [WordPress Trac] #51988: Call to undefined function mysql_connect()

[WordPress Trac]

#51988: Call to undefined function mysql_connect()
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 Reporter:  bgin          |       Owner:  (none)
     Type:  defect (bug)  |      Status:  reopened
 Priority:  normal        |   Milestone:  Future Release
Component:  Database      |     Version:  5.6
 Severity:  normal        |  Resolution:
 Keywords:  php8          |     Focuses:
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Comment (by SergeyBiryukov):

 {{{
 Fatal error: Uncaught Error: Call to undefined function mysql_connect() in
 wp-includes/class-wpdb.php:1963
 }}}

 I was able to reproduce this error message by accidentally using a non-
 thread safe version of PHP as an Apache module, instead of the thread safe
 version recommended in that case. Switching to the latter resolved the
 issue.

 Not 100% sure why, but `phpinfo()` shows that `mysqli` is only available
 in thread safe version, while `mysqlnd` is available in both.

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Ticket URL: <https://core.trac.wordpress.org/ticket/51988#comment:16>
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