API functions do not know if they are being called from a web page, or a
web-service. They need a single function to call to correctly apply
filters, strip tags etc that knows the correct way to do this based on
the way it was called (e.g. webservices allow parameters for skipping
filters etc).
So here we are fixing the default for the filter argument used in
external_format_text and adding a matching external_format_string.
This is a new script that can call any function in the built-in AJAX webservice. This is
a new system service that is added at install time (like the mobile webservice). It has no
protocols added to it, but it accessible by a new ajax script /lib/ajax/service.php.
Requests and responses to the script are required to be in json format, and multiple functions can
be called in a single request.
Also:
- We don't allow users to add deprecated functions to WS
- We show a debugging message when deprecated functions
are already being used in web services.
VALUE_REQUIRED - if the parameter is not supplied, there is an error
VALUE_OPTIONAL - if the parameter is not supplied, then the param has no value
VALUE_DEFAULT - if the parameter is not supplied, then the default value is used