[wp-trac] [WordPress Trac] #55105: Introduce a polyfill for `array_is_list()`.

[WordPress Trac]

#55105: Introduce a polyfill for `array_is_list()`.
-----------------------------+-----------------------------
 Reporter:  costdev          |      Owner:  (none)
     Type:  feature request  |     Status:  new
 Priority:  normal           |  Milestone:  Awaiting Review
Component:  General          |    Version:  5.9
 Severity:  minor            |   Keywords:
  Focuses:                   |
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 PHP 8.1 introduces a new function, `array_is_list()`.

 The function determines whether an array's keys consist of consecutive
 numbers from `0` to `count( $arr ) - 1`.

 Including a polyfill will allow developers to take advantage of the new
 function.

 **Notes**
 - A list must start from an offset of 0. `array( 2 => 'one', 3 => 'two'
 );` will return `false`.
 - An empty array will return `true`.

 **References**
 - PHP Manual: [https://www.php.net/manual/en/function.array-is-list.php
 array_is_list]
 - PHP RFC: [https://wiki.php.net/rfc/is_list Add array_is_list]
 - 3v4l.org: [https://3v4l.org/agfKh Examples]

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Ticket URL: <https://core.trac.wordpress.org/ticket/55105>
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