Fatal error: Uncaught Error: Undefined constant "foo" in /in/r3fJ0:3
Stack trace:
#0 {main}
thrown in /in/r3fJ0 on line 3
Process exited with code 255.
Warning: Use of undefined constant foo - assumed 'foo' (this will throw an Error in a future version of PHP) in /in/r3fJ0 on line 3
bool(false)
bool(false)
bool(true)