[wp-trac] [WordPress Trac] #31259: Replace array_shift() with current() where appropriate

[WordPress Trac]

#31259: Replace array_shift() with current() where appropriate
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 Reporter:  SergeyBiryukov  |      Owner:
     Type:  defect (bug)    |     Status:  new
 Priority:  normal          |  Milestone:  4.2
Component:  General         |    Version:
 Severity:  normal          |   Keywords:  has-patch needs-testing
  Focuses:  performance     |
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 Background: #31182

 `array_shift()` recalculates array indexes, and can be slow on large
 arrays. Most of the time, this is unnecessary, as we only use it to get
 the first element of the array, and the array is never used later.

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Ticket URL: <https://core.trac.wordpress.org/ticket/31259>
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