Split the tests for `wp_json_encode()` into smaller chunks (let's all them "units"). Skip a couple of these tests when running on older versions of PHP that don't support the tested functionality.

See #28786.


git-svn-id: https://develop.svn.wordpress.org/trunk@30533 602fd350-edb4-49c9-b593-d223f7449a82
`json_encode()` returns different results for non UTF-8 strings in PHP 5.5+, versus earlier versions of PHP.

This fixes the unit tests that fail in earlier versions, see #30471 for fixing this globally in `wp_json_encode()`.


git-svn-id: https://develop.svn.wordpress.org/trunk@30534 602fd350-edb4-49c9-b593-d223f7449a82
Remove HTML `<head>` tags from DocBlock summaries in wp-admin/admin-header.php.

Also better-specify the `$hook_suffix` value in the `admin_head-$hook_suffix` hook docs per hook documentation precedent.

Props rarst for the initial patch.
See #30473


git-svn-id: https://develop.svn.wordpress.org/trunk@30535 602fd350-edb4-49c9-b593-d223f7449a82
Ensure inline code is markdown-escaped as such, and that code snippets in descriptions are properly indented.

Affects DocBlocks for the following core elements:
* Two arguments in `_walk_bookmarks()`
* A code snippet in the class header for `WP_Roles`
* A code snippet in the class header for `WP_HTTP_Proxy`
* Inline code fixes in the summary and a parameter description for `WP_oEmbed::discover()`
* An argument description in `_WP_Editors::parse_settings()`
* Inline code fixes in the summary and a parameter description the `embed_oembed_discover` hook.

Props rarst.
See #30473.


git-svn-id: https://develop.svn.wordpress.org/trunk@30536 602fd350-edb4-49c9-b593-d223f7449a82
Ensure inline code is markdown-escaped as such, and that code snippets in descriptions are properly indented.

Affects DocBlocks for the following core elements:
* Backtick-escapes a `<link>` tag in a parameter description for the `embed_oembed_discover` hook
* Inline code fixes in the summary and return description for `WP_List_Table::get_table_classes()`
* Removes HTML markup from the summary for `WP_List_Table::display_rows_or_placeholder()`
* Backtick-escapes a `<tr>` tag in a parameter description for `WP_Users_List_Table::single_row()`
* Converts non-DocBlocks into multi-line comments in `WP_Dependencies::do_items()`
* Removes HTML markup from the summary for the `comment_form_top` hook.
* Inline code and snippet fixes in the description for `wp_get_schedules()`

Props rarst for the initial patch.
See #30473.


git-svn-id: https://develop.svn.wordpress.org/trunk@30537 602fd350-edb4-49c9-b593-d223f7449a82
Merge branch 'master' of git://develop.git.wordpress.org
I'll raise your MySQL with my MariaDB