[wp-trac] [WordPress Trac] #39867: actions overwrite variables

[WordPress Trac]

#39867: actions overwrite variables
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 Reporter:  tazotodua     |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  General       |    Version:
 Severity:  normal        |   Keywords:
  Focuses:                |
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 hello.
 for example,we have:

 {{{#!php
 add_action('wp_head','my_function');

 function my_function($first=false){
     var_dump($first); exit;
 }
 }}}

 it doesnt show `false`, instead something empty string is passed from the
 action... why?   I think actions should not touch the arguments of
 functions..

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Ticket URL: <https://core.trac.wordpress.org/ticket/39867>
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