[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:  flixos90
     Type:  enhancement       |      Status:  reviewing
 Priority:  normal            |   Milestone:  6.4
Component:  Themes            |     Version:
 Severity:  normal            |  Resolution:
 Keywords:  has-patch commit  |     Focuses:  performance
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Changes (by flixos90):

 * component:  General => Themes


Comment:

 Changing the component since this is exclusive to the `WP_Theme_JSON`
 class.

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Ticket URL: <https://core.trac.wordpress.org/ticket/57067#comment:16>
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