class_implements()¶
class_implements() returns an array of all interfaces implemented by a given class, including interfaces implemented by its parent classes. The keys and values of the returned array are both the interface names.
An optional second parameter (default true) controls whether the autoloader should be invoked if the class does not yet exist. Pass false to suppress autoloading.
class_implements() returns false if the class does not exist and autoloading is disabled.
Related functions are class_parents() (returns parent classes) and class_uses() (returns traits used by the class).
<?php
interface Countable {}
interface Stringable {}
class MyCollection implements Countable, Stringable {
public function count(): int { return 0; }
public function __toString(): string { return ''; }
}
$interfaces = class_implements(MyCollection::class);
// ['Countable' => 'Countable', 'Stringable' => 'Stringable']
// Also works with a string class name
$interfaces = class_implements('MyCollection');
// Works on instances too
$obj = new MyCollection();
$interfaces = class_implements($obj);
var_dump(isset($interfaces['Countable'])); // true
?>
See also class_implements - PHP Manual.
Related : Interface, implements, Introspection
Added in PHP 5.1
