code example of adding new function into elgg REST API interfaces in 1.8.19 version of elgg

gistfile1.txt

diff --git a/elgg-1.8.19/engine/lib/web_services.php b/elgg-1.8.19/engine/lib/web_services.php
index 51cad6f..d66e16a 100644
--- a/elgg-1.8.19/engine/lib/web_services.php
+++ b/elgg-1.8.19/engine/lib/web_services.php
@@ -1448,7 +1448,22 @@ function api_init() {
                false,
                false
        );

       // test
       expose_function("test.echo",
               "my_echo",
               array("string" => array('type' => 'string')),
               'A testing method which echos back a string',
               'GET',
               false,
               false
       );


 }

function my_echo($string) {
       return $string;
}