[wp-trac] [WordPress Trac] #38650: Provide some guidance on what conditionals can/should be used in default-filters.php

[WordPress Trac]

#38650: Provide some guidance on what conditionals can/should be used in default-
filters.php
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 Reporter:  helen           |       Owner:  jorbin
     Type:  enhancement     |      Status:  closed
 Priority:  low             |   Milestone:  6.7
Component:  Bootstrap/Load  |     Version:
 Severity:  minor           |  Resolution:  fixed
 Keywords:  has-patch       |     Focuses:  docs
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Comment (by utech1):

 In `default-filters.php`, you can't use functions like `get_option()` or
 `is_customize_preview()` due to how loading works. It's often confusing,
 so adding an inline comment at the top explaining the file's purpose and
 what functions are safe to use (like those in `load.php`) would be
 helpful.

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Ticket URL: <https://core.trac.wordpress.org/ticket/38650#comment:5>
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