[wp-trac] [WordPress Trac] #49678: do_action default first parameter

[WordPress Trac]

#49678: do_action default first parameter
--------------------------+------------------------------
 Reporter:  Tkama         |       Owner:  (none)
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  Plugins       |     Version:  5.3.2
 Severity:  normal        |  Resolution:
 Keywords:  dev-feedback  |     Focuses:
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Comment (by Tkama):

 @donmhico thanks. There is no difficulties to find the reason and fix it
 for me. The idea of this ticket: maybe it's better to fix core code for
 more predictable behavior of such code.

 For example:

 {{{#!php
 <?php
 add_action( 'action_name', function( $first = 'foo' ){
      // some logic

      echo $first
 } );

 do_action( 'action_name' );
 }}}

 As we can see. We don't pass any params to
 {{{
 do_action( 'action_name' );
 }}}
 and we expect the code print `foo` but not `''`.

 Such hook-call logic we can use, for example, for plugins when we want
 wrap some plugin function, for save plugin deactivation when plugin
 function is used inside the theme template files.

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Ticket URL: <https://core.trac.wordpress.org/ticket/49678#comment:3>
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