The currently availible OntoWiki version at the developer branch requires PHP 5.3.. Version 5.2 can not create anonymous function on the fly. Therefore, the following lines of code have to be replaced


set_error_handler(
function ($errno, $errstr, $errfile, $errline, array $errcontext){
// error was suppressed with the @-operator
if (0 === error_reporting()) {
return false;
}
throw new ErrorException($errstr, 0, $errno, $errfile, $errline);
}
);

by the following lines of code.


function myhandler ($errno, $errstr, $errfile, $errline, array $errcontext){
// error was suppressed with the @-operator
if (0 === error_reporting()) {
return false;
}
throw new ErrorException($errstr, 0, $errno, $errfile, $errline);
}
set_error_handler('myhandler');

Thank you for pointing this out to Jonas Brekle.