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Joe McGill 7710b3d3ec Media: Improve image filetype checking.
This adds a new function `wp_get_image_mime()` which is used by
`wp_check_filetype_and_ext()` to validate image files using
`exif_imagetype()` if available instead of `getimagesize()`.

`getimagesize()` is less performant than `exif_imagetype()` and is
dependent on GD. If `exif_imagetype()` is not available, it falls back to
`getimagesize()` as before.

If `wp_check_filetype_and_ext()` can't validate the filetype, we now return
`false` for ext/MIME values.

See #11946.

git-svn-id: https://develop.svn.wordpress.org/trunk@39831 602fd350-edb4-49c9-b593-d223f7449a82
2017-01-11 13:07:54 +00:00
src Media: Improve image filetype checking. 2017-01-11 13:07:54 +00:00
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