calculate the difference of each values of array

Question

Newbie here in PHP programming. I have some question regarding arrays. How can I get the difference between adjacent values in an array?

$value = array(2, 5, 9,          


        

Answer 1

Just use a simple for loop:

$diffs = array();
for ($i = 1, $n = count($value); $i < $n; $i++) {
    $diffs[] = $value[$i] - $value[$i-1];
}