input: [==] false [true] false [false] true [1] false [0] true [-1] false [„1“] false [„0“] true [„-1″] false [array()] true [array(1)] false [array(„php“)] false [„php“] false [„“] true [NAN] false [null] 
output: true
options: f a l s e
options: t r u e