问这有可能计算相同数组php中两个值之间的差异吗？

EN

<?php
$array=array('2','4','9','16');

foreach( $array as $k=> $v){
 if($v !=end($array)){
   echo $v-$array[$k+1]."\n";
 }
}

$array = array(2, 4, 9, 16);

$output = array();

foreach ($array as $key => $number) {
    if (isset($array[$key+1])) {
        $output[$number] = $number - $array[$key+1];
    }
}

var_dump($output);

array(3) {
  [2]=>
  int(-2)
  [4]=>
  int(-5)
  [9]=>
  int(-7)
}

$test_array = array(1,5,12,24,79);
$new_array = array();

$array_length = sizeof($test_array);

for($n = 1; $n <= ($array_length - 1); $n++)
{
    // Get the current value
    $x = current($test_array);

    // Move the internal pointer
    next($test_array);

    // Get the next value
    $y = current($test_array);

    // Calculate the result in the new array
    $new_array[] = $x-$y;
}