x
<html><body>$a = 32;echo "a is " . is_integer($a) . "<br>";$b = 0;echo "b is " . is_integer($b) . "<br>";$c = 32.5;echo "c is " . is_integer($c) . "<br>";$d = "32";echo "d is " . is_integer($d) . "<br>";$e = true;echo "e is " . is_integer($e) . "<br>";$f = "null";echo "f is " . is_integer($f) . "<br>";</body></html>a 是 1
b 是 1
c 是
d 是
e 是
f 是
b 是 1
c 是
d 是
e 是
f 是