$array1 = array ("a" => "green", "red", "blue");
$array2 = array ("b" => "green", "yellow", "red");

if (false == empty(array_intersect ($array1, $array2)))
{
	echo 1;	
}

Log output:
PHP Parse error:  parse error, unexpected T_STRING, expecting T_VARIABLE or '$' in /var/www/test/arint.php on line 6

line 6 is the line with IF statement.

However the following code works perfectly:

$array1 = array ("a" => "green", "red", "blue");
$array2 = array ("b" => "green", "yellow", "red");
$result = array_intersect ($array1, $array2);

if (false == empty($result))
{
	echo 1;	
}