[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
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 Reporter:  kkmuffme                  |       Owner:  (none)
     Type:  defect (bug)              |      Status:  new
 Priority:  normal                    |   Milestone:  Awaiting Review
Component:  Plugins                   |     Version:  trunk
 Severity:  normal                    |  Resolution:
 Keywords:  has-patch has-unit-tests  |     Focuses:
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Description changed by sabernhardt:

Old description:

> ```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.

New description:

 {{{#!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 #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#comment:2>
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