Returns the type of the PHP variable var.
Possibles values for the returned string are:
"boolean"
"integer"
"double"
"string"
"array"
"object"
"resource"
"user function" (PHP 3 only, deprecated)
"unknown type"
For PHP 4, you should use function_exists() and method_exists() to replace the prior usage of gettype() on a function.
See also settype().