Sergey Biryukov d6bae0ceda Code Modernization: Use correct default value for JavaScript translations path.
The `$path` parameter of `load_script_textdomain()` had a default value of `null`, but would be passed onto the `untrailingslashit()` function without any input validation, even though the latter explicitly only expects/supports a string input.

This commit changes the default value for `$path` to an empty string, and adds an `is_string()` check before passing the value to `untrailingslashit()` to fix the issue at the point where the invalid input is incorrectly (not) validated.

Note: Changing the `untrailingslashit()` function is outside the scope of this commit.

Includes:
* Adding a dedicated unit test for this issue.
* Correcting the default value for `$path` from `null` to an empty string in a few related methods and functions:
 * `WP_Dependency::set_translations()`
 * `WP_Scripts::set_translations()`
 * `wp_set_script_translations()`
 * `load_script_textdomain()`

This fix also allows to remove a couple of calls to `expectDeprecation()` in unrelated tests.

Fixes an error when running the test suite:
{{{
4) Tests_Dependencies_Scripts::test_wp_external_wp_i18n_print_order
rtrim(): Passing null to parameter #1 ($string) of type string is deprecated

/var/www/src/wp-includes/formatting.php:2782
/var/www/src/wp-includes/l10n.php:1068
/var/www/src/wp-includes/class.wp-scripts.php:605
/var/www/src/wp-includes/class.wp-scripts.php:320
/var/www/src/wp-includes/class.wp-dependencies.php:136
/var/www/src/wp-includes/functions.wp-scripts.php:109
/var/www/tests/phpunit/tests/dependencies/scripts.php:1505
/var/www/tests/phpunit/includes/utils.php:436
/var/www/tests/phpunit/tests/dependencies/scripts.php:1507
/var/www/vendor/bin/phpunit:123
}}}

Follow-up to [44169], [44607], [51968].

Props jrf, ocean90, Chouby, swissspidy, lovor, iviweb, meysamnorouzi, DarkoG, oneearth27, SergeyBiryukov.
Fixes #55967. See #55656.

git-svn-id: https://develop.svn.wordpress.org/trunk@54349 602fd350-edb4-49c9-b593-d223f7449a82
2022-09-28 17:31:53 +00:00
..