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For certain images, `wp_exif_frac2dec()` unexpectedly returned a string instead of `int` or `float`. This can occur when an image is missing meta and calls the function with `'0/0'`. For those images, a fatal error was thrown on PHP 8.0+:
{{{
TypeError: round(): Argument #1 ($num) must be of type int|float, string given
}}}
Upon deeper review, inconsistent and unexpected results were returned from different types of input values passed to the function.
Changes are:
* Maintains backwards-compatibility for valid input values.
* Fixes handling of invalid input values by bailing out to return the documented type of `int|float` by returning `0`.
* Improves the fractional conditional check.
* Improves the calculated fraction handling to ensure (a) the numerator and denominator are both numeric and (b) the denominator is not equal to zero.
* Safeguards the behavior via tests for all possible ways code could flow through the function.
* Safeguards the backwards-compatibility of the `wp_read_image_metadata()` by adding some defensive coding around the calls to the `wp_exif_frac2dec()` function.
These changes fix the fatal error and make the function more secure, stable, and predictable while maintaining backwards-compatibility for valid input values.
Follow-up to [6313], [9119], [22319], [28367], [45611], [47287].
Props adamsilverstein, jrf, peterwilsoncc, praem90, stevegs, tobiasbg.
Fixes #54385.
git-svn-id: https://develop.svn.wordpress.org/trunk@52269 602fd350-edb4-49c9-b593-d223f7449a82
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The short version:
1. Create a clean MySQL database and user. DO NOT USE AN EXISTING DATABASE or you will lose data, guaranteed.
2. Copy wp-tests-config-sample.php to wp-tests-config.php, edit it and include your database name/user/password.
3. $ svn up
4. Run the tests from the "trunk" directory:
To execute a particular test:
$ phpunit tests/phpunit/tests/test_case.php
To execute all tests:
$ phpunit
Notes:
Test cases live in the 'tests' subdirectory. All files in that directory will be included by default. Extend the WP_UnitTestCase class to ensure your test is run.
phpunit will initialize and install a (more or less) complete running copy of WordPress each time it is run. This makes it possible to run functional interface and module tests against a fully working database and codebase, as opposed to pure unit tests with mock objects and stubs. Pure unit tests may be used also, of course.
Changes to the test database will be rolled back as tests are finished, to ensure a clean start next time the tests are run.
phpunit is intended to run at the command line, not via a web server.