<?
class widget
{
var $name;
var $length;
}
$thing = new widget;
if(is_object($thing))
{
print("thing is an object");
}
?>
boolean is_real(expression)
The is_real function is an alias for the is_double function.
boolean is_resource(variable)
This function returns TRUE if the given variable is a resource. A resource is an integer
used to identify a system resource. An example is the return value of fopen.
boolean is_string(expression)
The is_string function returns TRUE if the expression is a string, FALSE otherwise.
<?
$Greeting = "Hello";
if(is_string($Greeting))
{
print("Greeting is a string");
}
?>
boolean isset(variable)
The isset function returns TRUE if the variable has been given a value, or FALSE if the
variable has never been on the left side of a set operator. In other words, it tests that the
variable has been set with a value.
<?
if(isset($Name))
{