如何在数组中使用运算符

Question

I have array like this

$a = array("15", "4", "3", "2");

to calculate I use array_sum($a);

how to use minus(-), devide(/) or multiple(*)

I want to 15 - 4 - 3 + 2 = 10

$result = 10;

Answer 1

Firstly, strings are wrapped in quotes, numeric values aren't. Secondly, just follow math rules.

$a = array(15, 4, 3, 2);  // No quotes around numeric values
$b = $a[0] - $a[1] - $a[2] + $a[3];  // simple math