[wp-trac] [WordPress Trac] #28077: Use exif_imagetype instead of getimagesize in file_is_displayable_image

[WordPress Trac]

#28077: Use exif_imagetype instead of getimagesize in file_is_displayable_image
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 Reporter:  joehoyle     |       Owner:
     Type:  enhancement  |      Status:  new
 Priority:  normal       |   Milestone:  Awaiting Review
Component:  Media        |     Version:  3.9
 Severity:  normal       |  Resolution:
 Keywords:               |     Focuses:
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Comment (by jdgrimes):

 You need to check if `is_callable( 'exif_imagetype' )` and fall back to
 `getimagesize()` if not, because the exif extension may not be loaded.
 That may negate the speed increases.

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Ticket URL: <https://core.trac.wordpress.org/ticket/28077#comment:1>
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