[wp-trac] [WordPress Trac] #59774: Undefined array key when using wp_list_pluck function

[WordPress Trac]

#59774: Undefined array key when using wp_list_pluck function
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 Reporter:  iamarunchaitanyajami                 |       Owner:
                                                 |  hellofromTonya
     Type:  defect (bug)                         |      Status:  reviewing
 Priority:  normal                               |   Milestone:  6.5
Component:  General                              |     Version:  5.1
 Severity:  normal                               |  Resolution:
 Keywords:  has-patch has-testing-info has-      |     Focuses:
  unit-tests commit                              |
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Comment (by hellofromTonya):

 Hmm wait. Upon a deeper look, this ticket is resolving 2 the PHP warning
 and setting `null` for the item in the returned list.

 When comparing the results of:

 {{{#!php
 $input_list = array(
     array( '123' => '456' ),
     array( 'foo' => 'bar' ),
     array( 'foo' => 'baz' ),
 );
 var_dump( array_column( $input_list, 'foo', null ) );
 var_dump( wp_list_pluck( $input_list, 'foo', null ) );
 }}}

 `array_column()` prints:
 {{{
 array(2) {
   [0]=>
   string(3) "bar"
   [1]=>
   string(3) "baz"
 }
 }}}

 but `wp_list_pluck()` prints:
 {{{
 Warning: Undefined array key "foo" in ...
 array(3) {
   [0]=>
   NULL
   [1]=>
   string(3) "bar"
   [2]=>
   string(3) "baz"
 }
 }}}

 Notice the difference. The first element is `null`. So the issue is more
 than the a PHP Warning, as the `NULL` should not be there.

-- 
Ticket URL: <https://core.trac.wordpress.org/ticket/59774#comment:12>
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