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(PHP 5)
ReflectionClass::isInstance — Checks class for instance
Checks if an object is an instance of a class.
The object being compared to.
Gibt bei Erfolg TRUE zurück. Im Fehlerfall wird FALSE zurückgegeben.
Beispiel #1 ReflectionClass::isInstance() related examples
<?php
// Example usage
$class = new ReflectionClass('Foo');
if ($class->isInstance($arg)) {
echo "Yes";
}
// Equivalent to
if ($arg instanceof Foo) {
echo "Yes";
}
// Equivalent to
if (is_a($arg, 'Foo')) {
echo "Yes";
}
?>
Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:
Yes Yes Yes
This function has a flaw in PHP versions < 5.3.* (my tested version was 5.3.2), in which class inheritance is not handled properly. The following test case renders true in 5.3.2, but false on 5.2.9:
<?php
class A {
}
class B extends A {
public function foo(A $a) {
}
}
$b = new B();
$class = new ReflectionClass('B');
$method = $class->getMethod('foo');
$parameters = $method->getParameters();
$param = $parameters[0];
$class = $param->getClass();
var_dump($class->isInstance($b));
?>
If you're running a PHP version lower than 5.3, my suggestion is to use the following fix:
<?php
[...]
$param = $parameters[0];
$class = $param->getClass();
$classname = $class->getName();
var_dump($b instanceof $classname);
?>
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