Array Reducing

Reducing combines many array values into one result.

array_reducing.php

<?php
$start = ;
$total = $start;

foreach ([1, 2, 3, 4] as $value) {
    $total = $total + $value;
}

$difference = $total - $start;

echo "start=" . $start . "\n";
echo "total=" . $total . "\n";
echo "difference=" . $difference . "\n";

<?php
$start = ;
$total = $start;

foreach ([1, 2, 3, 4] as $value) {
    $total = $total + $value;
}

$difference = $total - $start;

echo "start=" . $start . "\n";
echo "total=" . $total . "\n";
echo "difference=" . $difference . "\n";

<?php
$start = ;
$total = $start;

foreach ([1, 2, 3, 4] as $value) {
    $total = $total + $value;
}

$difference = $total - $start;

echo "start=" . $start . "\n";
echo "total=" . $total . "\n";
echo "difference=" . $difference . "\n";

accumulator An accumulator stores the running result while a loop combines values.