[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       |   Keywords:
  Focuses:               |
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 From http://us3.php.net/manual/en/function.exif-imagetype.php:

 > exif_imagetype — Determine the type of an image

 > When a correct signature is found, the appropriate constant value will
 be returned otherwise the return value is FALSE. The return value is the
 same value that getimagesize() returns in index 2 but exif_imagetype() is
 much faster.

 For whatever reason, `getimagesize` also fails to read the type from a
 Custom Stream Wrapper, whereas `exif_imagetype` reports that correctly.

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