[wp-trac] [WordPress Trac] #12824: Allow a method to be used for unique_filename_callback

[WordPress Trac]

#12824: Allow a method to be used for unique_filename_callback
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 Reporter:  aaroncampbell  |       Owner:                         
     Type:  defect (bug)   |      Status:  new                    
 Priority:  normal         |   Milestone:  3.0                    
Component:  General        |     Version:                         
 Severity:  normal         |    Keywords:  has-patch needs-testing
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 Currently `$unique_filename_callback` in `wp_unique_filename()` can only
 be a function not a method.  Simply replacing `function_exists` with
 `is_callable` fixes it.

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Ticket URL: <http://core.trac.wordpress.org/ticket/12824>
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