$a = 98;
echo gettype($a) . "\n";
$b = 3.14;
echo gettype($b) . "\n";
$c = "PHP";
echo gettype($c) . "\n";
$d = array();
echo gettype($d) . "\n";
$e = array("php", "c", "java");
echo gettype($e) . "\n";
$f = NULL;
echo gettype($f) . "\n";
$g = false;
echo gettype($g) . "\n";
/*
run:
integer
double
string
array
array
NULL
boolean
*/