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Joe McGill 879f152f69 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.

Merges [39831] to the 4.7 branch.


git-svn-id: https://develop.svn.wordpress.org/branches/4.7@39832 602fd350-edb4-49c9-b593-d223f7449a82
2017-01-11 13:11:52 +00:00
src Media: Improve image filetype checking. 2017-01-11 13:11:52 +00:00
tests Customize: Ensure theme_mod-cache of custom_css lookup of -1 short-circuits a WP_Query from being made. 2017-01-05 08:14:56 +00:00
tools/i18n DOCS: Replace HTTP links with HTTPS. 2016-06-10 04:49:09 +00:00
.editorconfig
.gitignore Revert [38401] after [38480]. 2016-09-06 18:12:09 +00:00
.jshintrc Build: Prevent non-breaking spaces from accidentally being inserted into JavaScript files. 2015-11-12 12:04:55 +00:00
.travis.yml Build/Test Tools: Remove PHP 7.1 from allowed failures 2016-12-02 06:43:46 +00:00
Gruntfile.js Build/Test tools: Add "apply" as alias for "patch" 2016-11-10 03:21:39 +00:00
npm-shrinkwrap.json Build: Remove fsevents from npm-shrinkwrap.json 2016-11-29 04:02:23 +00:00
package.json Bump the version in package.json to 4.7.1 after [39576]. 2016-12-12 06:06:51 +00:00
phpunit.xml.dist oEmbed: Remove the oEmbed provider unit tests. 2016-10-20 09:15:10 +00:00
wp-cli.yml Remove debug mode from WP-CLI by default, as it now outputs too much debugging information to be of use during normal development. 2015-11-28 18:36:06 +00:00
wp-config-sample.php
wp-tests-config-sample.php Tests: Use a minimal theme for tests. 2016-10-21 11:02:37 +00:00