[wp-trac] [WordPress Trac] #58943: Replace `is_a` calls in core with `instanceof`

[WordPress Trac]

#58943: Replace `is_a` calls in core with `instanceof`
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 Reporter:  ayeshrajans  |       Owner:  SergeyBiryukov
     Type:  enhancement  |      Status:  accepted
 Priority:  normal       |   Milestone:  6.4
Component:  General      |     Version:  trunk
 Severity:  trivial      |  Resolution:
 Keywords:  has-patch    |     Focuses:  performance, coding-standards
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Comment (by jrf):

 FYI: I've opened a ticket to at some point create a sniff to detect & flag
 this, so we can safeguard this pattern for the future:
 https://github.com/PHPCSStandards/PHPCSExtra/issues/260

 We may want to open a ticket in WPCS about this as well.

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Ticket URL: <https://core.trac.wordpress.org/ticket/58943#comment:7>
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