# assertArrayHasKey() >[info] ## assertArrayHasKey(mixed $key, array $array[, string $message = '']) 当 `$array` 不包含 `$key` 时报告错误，错误讯息由 `$message` 指定。 `assertArrayNotHasKey()` 是与之相反的断言，接受相同的参数。 **Example A.1. assertArrayHasKey() 的用法** ~~~ <?php class ArrayHasKeyTest extends PHPUnit_Framework_TestCase { public function testFailure() { $this->assertArrayHasKey('foo', array('bar' => 'baz')); } } ?> ~~~ ~~~ phpunit ArrayHasKeyTest PHPUnit 5.0.0 by Sebastian Bergmann and contributors. F Time: 0 seconds, Memory: 5.00Mb There was 1 failure: 1) ArrayHasKeyTest::testFailure Failed asserting that an array has the key 'foo'. /home/sb/ArrayHasKeyTest.php:6 FAILURES! Tests: 1, Assertions: 1, Failures: 1. ~~~