_processor; while(($line = fgets($fh))) { echo $p($line); } } public function setProcessor($p) { $this->_processor = $p; } } $v8 = new V8Js(); $v8->lp = new LineProcessor(); $v8->startDebugAgent('LineProcessor', 9222, V8Js::DEBUG_AUTO_BREAK_NEVER); $JS = <<< EOT print("Hello LineProcessor User!\\n"); PHP.lp.setProcessor(function (foo) { return foo.toUpperCase(); }); PHP.lp.readLineLoop(); EOT; $v8->executeString($JS, 'processor.js');