function testStructure() { $data = array('num_array' => array(134, '456', 'abc', '123abc')); $filter = new DeclFilter(); $filter->addStaticKeyFiltersForArrays(array('num_array' => 'digits')); $data = $filter->filter($data); $this->assertContains('134', $data['num_array']); $this->assertContains('456', $data['num_array']); $this->assertContains('123', $data['num_array']); $this->assertNotContains('abc', $data); }