plivo/plivo-php — pull request #8 by travisaustin (2013-09-15 16:30:15+00:00)
Title: Child classes must match signature of extended parent classes

"function Response::toXML()" must be defined as "function Response::toXML($header=FALSE)" or else E_STRICT warnings are thrown. To replicate this,
set "error_reporting = E_ALL | E_STRICT".

The next line "parent::toXML(TRUE)" correctly calls the parent with the correct parameter.