MDL-15813 "return params or a param from moodle_url params and param method when...

MDL-15813 "return params or a param from moodle_url params and param method when no value is passed to method to set url param(s)."

Methods param and params can now be used in the following ways :

$url->params(); // returns params

$url->params($arrayofnewparams);// add params to url params and then returns all the params.

//--

$url->param('id');//returns value of id param.

$url->param('id', 5); set id param to 5.