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assertArrayHasKey()函数是PHPUnit中的内置函数，用于断言具有特定键的数组，如果数组具有提供的键，则此断言将返回true;否则返回false;如果为true，则断言测试用例通过了，否则测试用例失败。

用法：

assertArrayHasKey(mixed $key, array $array[, string $message = ''])

参数：该函数接受三个参数，如以上语法所示。参数说明如下：

$key：此参数表示数组要包含的键的名称。

$array：此参数是要为其搜索 key 的数组。

$message：此参数采用字符串值。当测试用例失败时，此字符串消息将显示为错误消息。

以下示例程序旨在说明assertArrayHasKey()函数：

程序1:：

use PHPUnit\Framework\TestCase;

class GeeksPhpunitTestCase extends TestCase

{

public function testNegativeTestcaseForArrayHasKey()

{

// array to be tested

$array  = array('geek' => 'geeksForgeeks', );

// assert function to test whether 'geek' is a key of array

$this->assertArrayHasKey('geeks', $array, "Array doesn't contains 'geeks' as key");

}

}

?>

输出：

PHPUnit 6.5.5 by Sebastian Bergmann and contributors.

F 1 / 1 (100%)

Time:108 ms, Memory:4.00MB

There was 1 failure:

1) GeeksPhpunitTestCase::testNegativeTestcaseForArrayHasKey

Array doesn't contains 'geeks' as key

Failed asserting that an array has the key 'geeks'.

/home/shivam/Documents/geeks/phpunit/abc.php:9

FAILURES!

Tests:1, Assertions:1, Failures:1.

程序2:：

use PHPUnit\Framework\TestCase;

class GeeksPhpunitTestCase extends TestCase

{

public function testPositiveTestcaseForArrayHasKey()

{

// array to be tested

$array  = array('geeks' => 'geeksForgeeks', );

// assert function to test whether 'geeks' is a key of array

$this->assertArrayHasKey('geeks', $array, "Array doesn't contains 'geeks' as key");

}

}

?>

输出：

PHPUnit 6.5.5 by Sebastian Bergmann and contributors.

. 1 / 1 (100%)

Time:21 ms, Memory:4.00MB

OK (1 test, 1 assertion)

注意：要使用phpunit运行测试用例，请遵循此处的步骤。