is_a
Description
The is_a of Class / Object for PHP checks if the object is of this class or has this class as one of its parents.
Syntax
is_a(
mixed $object_or_class,
string $class,
bool $allow_string = false
): boolParameters
object_or_class
A class name or an object instance.
class
The class or interface name.
allow_string
If this parameter set to false, string class name as object_or_class is not allowed. This also prevents from calling autoloader if the class doesn't exist.
Return
Returns true if object_or_class is the class object type, or has class as one of its supertypes, false otherwise.
Examples
1 · object_or_class class
<?
class myclass
{
}
$object_or_class = new myclass();
$class = "myclass";
$return = is_a($object_or_class, $class);
var_export($return);
?>true
2 · allow_string · false
<?
class myclass
{
}
$object_or_class = "myclass";
$class = "myclass";
$allow_string = false;
$return = is_a($object_or_class, $class, $allow_string);
var_export($return);
?>false
3 · allow_string · true
<?
class myclass
{
}
$object_or_class = "myclass";
$class = "myclass";
$allow_string = true;
$return = is_a($object_or_class, $class, $allow_string);
var_export($return);
?>true
4 · namespace
<?
namespace mynamespace;
class myclass
{
}
$object_or_class = new myclass();
$class = "mynamespace\myclass";
$return = is_a($object_or_class, $class);
var_export($return);
?>true
5 · instanceof
<?
class myclass
{
}
$object_or_class = new myclass();
if($object_or_class instanceof myclass)
{
echo "true";
}
else
{
echo "false";
}
?>true
