It seems that a `null` value is treated as an array()

NullIsArray.php

<?php

$dummy= [        
	'Alpha' => null,
	'Beta' => null,
	'Charlie' => null
];

switch ($dummy['Alpha']) {
	case is_array($dummy['Alpha']) :
		echo 'gettype($dummy[\'Alpha\']) = '.gettype($dummy['Alpha'])."<br>";
		echo 'is_array($dummy[\'Alpha\']) = '.is_array($dummy['Alpha'])."<br>";
		echo 'Alpha, according to this switch statement, is Array';
		break;

	case is_numeric($dummy['Alpha']) :
		echo 'gettype($dummy[\'Alpha\']) = '.gettype($dummy['Alpha'])."<br>";
		echo 'is_array($dummy[\'Alpha\']) = '.is_array($dummy['Alpha'])."<br>";
		echo 'Alpha, according to this switch statement, is Numeric';
		break;

	default: 
		echo 'Alpha, according to this switch statement, is something else';
}