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<?php class MyClass { private $v; public function __construct( $v ) { $this->v = $v; } } $cb = static fn ( $o ) => $o instanceof MyClass; $objects = [ null, false, new MyClass( "foo" ), "bar", new MyClass( 123 ), ]; $result = array_filter( $objects, static fn ( $o ) => $o instanceof MyClass ); var_dump( $result );
Output for git.master_jit, git.master, rfc.property-hooks
array(2) { [2]=> object(MyClass)#2 (1) { ["v":"MyClass":private]=> string(3) "foo" } [4]=> object(MyClass)#3 (1) { ["v":"MyClass":private]=> int(123) } }

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