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<?php
function closestLowerHigherNr($array, $nr) {
	sort($array);
	$re_arr = array('lower'=>min(current($array), $nr), 'higher'=>max(end($array), $nr), 'closest'=>$nr);
	foreach($array AS $num){
		if($nr > $num) $re_arr['lower'] = $num;
		else if($nr <= $num){
			$re_arr['higher'] = $num;
			break;
		}
	}
	$re_arr['closest'] = (abs($nr - $re_arr['lower']) < abs($re_arr['higher'] - $nr)) ? $re_arr['lower'] : $re_arr['higher'];
 
	return $re_arr;
}
 
print_r(closestLowerHigherNr($array,180));

// The above function will return a associative array as
/*
Array ( 
   [lower] => 150 
   [higher] => 200 
   [closest] => 200 
)
*/