[wp-trac] [WordPress Trac] #40156: Warning for invalid hook callback is not very useful

[WordPress Trac]

#40156: Warning for invalid hook callback is not very useful
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 Reporter:  Shelob9      |       Owner:
     Type:  enhancement  |      Status:  new
 Priority:  normal       |   Milestone:  Awaiting Review
Component:  General      |     Version:  0.71
 Severity:  normal       |  Resolution:
 Keywords:               |     Focuses:
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Comment (by johnbillion):

 This is a good suggestion, but I ''think'' the reason the hooks and
 filters API doesn't first check the callback function with `is_callable()`
 is for performance reasons. Filters can be applied hundreds and even
 thousands of times on each page load, so even micro performance is
 important.

 A good place to start would be to add an `is_callable()` check and then
 run some benchmarks to see if it impacts performance.

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Ticket URL: <https://core.trac.wordpress.org/ticket/40156#comment:1>
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