Description:
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I realize you all are probably still working on updating the docs for PHP 7.3, but hopefully this list of findings will help <3

* The changelog for 7.3.0 - github.com/php/php-src/blob/PHP-7.3.0/UPGRADING - is missing a number of changelog entries which are included in the 7.3 changelog - github.com/php/php-src/blob/PHP-7.3/UPGRADING - for changes which *have* been shipped with 7.3.0.

Additionally, the migration guide makes no mention of the following:
* New functions:
    - `net_get_interfaces()` (also missing from UPGRADING, but mentioned in NEWS and php.net/ChangeLog-7.php#7.3.0)
    - `ldap_exop_refresh()` (also missing from UPGRADING, but mentioned in NEWS and php.net/ChangeLog-7.php#7.3.0)
* New constants:
    - `FILTER_SANITIZE_ADD_SLASHES` (mentioned in php.net/manual/en/migration73.other-changes.php#migration73.other-changes.filter, but not on the new constants page)
    - `LDAP_CONTROL_ASSERT`
    - `STREAM_CRYPTO_PROTO_TLSv1_0`
    - `STREAM_CRYPTO_PROTO_TLSv1_1`
    - `STREAM_CRYPTO_PROTO_TLSv1_2`

Other remarks:
* Lightweight Directory Access Protocol: php.net/manual/en/migration73.new-features.php#migration73.new-features.ldap vs the documentation of the `ldap_parse_result()` function php.net/manual/en/function.ldap-parse-result.php
    The way it looks to me, the documentation on the `ldap_parse_result()` function page is wrong. Not the `$serverctrls` parameter, but an `$out` parameter has been added. This is also listed wrong in the `Changelog` section of the page and the parameter is also missing from the `Parameters` documentation for the function.
* Lightweight Directory Access Protocol: php.net/manual/en/migration73.new-features.php#migration73.new-features.ldap vs the documentation of the `ldap_get_option()` function php.net/manual/en/function.ldap-get-option.php and the `ldap_set_option()` function php.net/manual/en/function.ldap-set-option.php
    The way it looks to me, the documentation on the `ldap_get_option()` and the `ldap_set_option()` function pages is missing the `since 7.3` for the `LDAP_OPT_SERVER_CONTROLS` and `LDAP_OPT_CLIENT_CONTROLS` options.
    If those were previously already supported, then the entry (third bullet) in the changelog probably needs improved wording.
* LDAP Constants php.net/manual/en/ldap.constants.php
    Looks like the new constants were added, but without a `since 7.3` mention.
* Continue Targeting Switch issues Warning: The second line of the error message is missing a `//` before it in the code sample in php.net/manual/en/migration73.incompatible.php#migration73.incompatible.core.continue-targeting-switch
* FastCGI Process Manager php.net/manual/en/migration73.new-features.php#migration73.new-features.fpm
    Looks like the new options aren't listed yet on php.net/manual/en/install.fpm.configuration.php
    And just to check my own comprehension: these are just to be used in `php-fpm.conf` ? and cannot be accessed through `ini_get()` or `ini_set()` ?
* Strip-Tags Streaming php.net/manual/en/migration73.deprecated.php#migration73.deprecated.core.strip-tags-streaming
    Looks like the affected functions has not been marked as deprecated yet - php.net/manual/en/function.fgetss.php (and the others).
    Looks like the deprecation of the `string.strip_tags` stream filter has not be annotated yet: php.net/manual/en/filters.string.php