/**
* get the average of the items
*
* @param array[array] $arr
* @param string $key
*/
public static function average($arr, $key = null)
{
if (!is_array($arr)) {
throw new \InvalidArgumentException('CCArr::average - first argunent has to be an array.');
}
if (is_string($key) && CCArr::is_multi($arr)) {
$arr = CCArr::pick($key, $arr);
}
return static::sum($arr) / count($arr);
}
/**
* test if array has multiple dimensions
*/
public function testArrayIsMulti()
{
// test
$this->assertTrue(CCArr::is_multi(array(array('name' => 'johnson', 'age' => 20))));
$this->assertTrue(CCArr::is_multi(array(array('name' => 'johnson', 'age' => 20), array('name' => 'Jack', 'age' => 25))));
$this->assertTrue(CCArr::is_multi(array(array('name' => 'johnson', 'age' => 20), array('name' => 'Jack', 'age' => 25), 'no array valie', 32)));
$this->assertFalse(CCArr::is_multi(array('jack', 'john', 'johnson')));
$this->assertFalse(CCArr::is_multi(array('jack' => 12, 'john' => 24, 'johnson' => 32)));
}
