[wp-trac] [WordPress Trac] #63430: Coding Standards: replace isset() ternary with null coalescing

[WordPress Trac]

#63430: Coding Standards: replace isset() ternary with null coalescing
------------------------------+-----------------------------
 Reporter:  seanwei           |      Owner:  (none)
     Type:  enhancement       |     Status:  new
 Priority:  normal            |  Milestone:  Awaiting Review
Component:  General           |    Version:  trunk
 Severity:  minor             |   Keywords:
  Focuses:  coding-standards  |
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 When reviewing the source code, I noticed some ternary expressions of the
 form `isset( $var ) ? $var : null`.

 Since PHP 7.0 introduced the [https://www.php.net/manual/en/migration70
 .new-features.php#migration70.new-features.null-coalesce-op null
 coalescing operator], and WordPress now requires at least PHP 7.2.24, we
 can safely replace these ternaries with the more concise `$var ?? null`
 syntax.

 To ensure the changeset is correct, I'd prefer break the changes to bulk
 of files instead of fixing entire project in one PR.
 I've changed manually with the help with IDE, and verify that the meaning
 of code is exactly the same.

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Ticket URL: <https://core.trac.wordpress.org/ticket/63430>
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