[wp-trac] [WordPress Trac] #60190: Drop PHP 4 support for arrays with 1 object element

[WordPress Trac]

#60190: Drop PHP 4 support for arrays with 1 object element
--------------------------+-----------------------------
 Reporter:  kkmuffme      |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Plugins       |    Version:  trunk
 Severity:  normal        |   Keywords:
  Focuses:                |
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 ```php
 do_action( 'foo', array( (object) null ) );

 function foo_cb( array $arg ) {}
 add_action( 'foo', 'foo_cb' );
 ```

 This will fail with a fatal error in PHP 7+, since `do_action` (as the
 only one, this isn't an issue with `apply_filters` or
 `do_action_ref_array`) will convert arrays with only 1 object into that
 object.
 The reason for that is some PHP 4 legacy behavior, see
 https://core.trac.wordpress.org/ticket/48312

 It's time to drop this PHP 4 support, as this prevent using native types
 in callback functions in cases where the argument is an array of objects.

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Ticket URL: <https://core.trac.wordpress.org/ticket/60190>
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