[wp-trac] [WordPress Trac] #57067: Replace certain `array_key_exists()` calls with `isset()` once PHP requirement is raised to 7.0+

[WordPress Trac]

#57067: Replace certain `array_key_exists()` calls with `isset()` once PHP
requirement is raised to 7.0+
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 Reporter:  flixos90     |       Owner:  (none)
     Type:  enhancement  |      Status:  new
 Priority:  normal       |   Milestone:  6.4
Component:  General      |     Version:
 Severity:  normal       |  Resolution:
 Keywords:  needs-patch  |     Focuses:  performance
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Comment (by Soean):

 I created a PR for the WP_Theme_JSON in the Gutenberg project:
 https://github.com/WordPress/gutenberg/pull/53098

 After merging, I will create a PR for Core.

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Ticket URL: <https://core.trac.wordpress.org/ticket/57067#comment:13>
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