On the first `foreach` loop in Text_Diff::_check()`, `$prevtype` is `null`. As `instanceof` requires the class name term to be an object or string, a fatal error is thrown:
>Fatal error: Uncaught Error: Class name must be a valid object or a string on line 279
This change:
* Adds a simple test for the `Text_Diff::_check()` method, which is how the bug was discovered as the test could never pass with the code as-is.
* Adds a defensive guard to protect against the fatal. It checks if `$prevtype` is not `null` as a pre-condition to for checking the instance. This bugfix also resolves the failing test.
Follow-up to [49194], [7747].
Props jrf, hellofromTonya.
See #62083.
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This changeset replaces contracted verb forms like `doesn't`, `can't`, or `isn't` with non-contracted forms like `does not`, `cannot`, or `is not`, for better consistency across the WordPress administration. It also updates some corresponding unit tests strings.
Props Presskopp, socalchristina, aandrewdixon, francina, SergeyBiryukov, JeffPaul, audrasjb, hellofromTonya.
Fixes#38913.
See #39176.
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PHP7 is deprecating PHP4 style constructors, so we need to modify our code to have _construct methods that fire before the named PHP4 style constructors. The PHP4 style constructors will call the PHP5 style constructor in case it is being called directly (usually via parent::METHOD).
This modifies external libraries to add PHP5 style constructors, but doesn't add a notice for when they are used. In WordPress core code, PHP4 style constructors are being given a call to _deprecated_constructor. To the PHP4 style constructor I say "I know that I can't take no more | It ain't no lie | I wanna see you out that door | Baby, bye, bye, bye..."
Upstream: https://wiki.php.net/rfc/remove_php4_constructors
Props jdgrimes, netweb, jorbin
See #31982
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hellofromTonya
Sergey Biryukov
audrasjb
John Blackbourn
Aaron Jorbin
Dominik Schilling
Andrew Nacin
nacin
ryan