подсчитать количество отрицательных чисел a,b,c в php

$a = -1;
$b = -2;
$c = 0;
$count_minus = 0;
if( $a < 0) {$count_minus = $count_minus + 1;}
if( $b < 0) {$count_minus = $count_minus + 1;}
if( $c < 0) {$count_minus = $count_minus + 1;}
echo $count_minus;