Notice: Use of undefined constant NAN - assumed 'NAN' in /in/5rDQm on line 3
Notice: Use of undefined constant NAN - assumed 'NAN' in /in/5rDQm on line 3
bool(true)
Notice: Use of undefined constant NAN - assumed 'NAN' in /in/5rDQm on line 4
Notice: Use of undefined constant NAN - assumed 'NAN' in /in/5rDQm on line 4
bool(true)