[wp-trac] [WordPress Trac] #15296: Filters don't check that the function is callable

[WordPress Trac]

#15296: Filters don't check that the function is callable
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 Reporter:  aaroncampbell  |       Owner:                 
     Type:  defect (bug)   |      Status:  new            
 Priority:  normal         |   Milestone:  Awaiting Review
Component:  Performance    |     Version:  3.0            
 Severity:  normal         |    Keywords:  dev-feedback   
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Comment(by nacin):

 Argument for:

  - Prevents silent failures by skipping the filter.

  - We code defensively for plugins in many other places.

 Arguments against:

  - Speed. We need these functions to be fast as possible.

  - The callback may not be available on add_filter, and apply_filters runs
 1500 times on a typical pageload. (300 times for add_filter -- per westi
 in IRC.)

  - Silent failures do not help plugin authors.

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Ticket URL: <http://core.trac.wordpress.org/ticket/15296#comment:4>
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