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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
): bool

Parameters

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