[wp-trac] [WordPress Trac] #42812: Use MySQLi when available by default

[WordPress Trac]

#42812: Use MySQLi when available by default
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 Reporter:  dd32                          |       Owner:  dd32
     Type:  enhancement                   |      Status:  closed
 Priority:  normal                        |   Milestone:  4.9.2
Component:  Database                      |     Version:
 Severity:  normal                        |  Resolution:  fixed
 Keywords:  has-patch commit fixed-major  |     Focuses:
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Comment (by rhirschfeld):

 It was perhaps a mistake to roll this out in a point release because:

 - Those using mysql on sites where both mysql and mysqli are available
 experienced breakage (I can't imagine I'm the only one).
 - It's not clear to the naive user that the breakage can be corrected by
 defining WP_USE_EXT_MYSQL as true (or even what caused the breakage), and
 until it is corrected database corruption can ensue.
 - Users have no opportunity to make a backup before an automatic update.

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Ticket URL: <https://core.trac.wordpress.org/ticket/42812#comment:7>
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