ネストforeachの配列ウチソト問題の計測用

大きいほうが外.php

<?php
  
$array1 = range(1, 1000000);
$array2 = range(1, 10);

$start = microtime(true);
$result = [];
foreach ($array1 as $value1) {
    foreach ($array2 as $value2) {
        $result[] = $value1 * $value2;
    }
}
$end = microtime(true);
var_dump(count($result));
echo "duration:".($end - $start)."\n";
echo "memory:".memory_get_peak_usage(true)."\n";

小さいほうが外.php

<?php
  
$array2 = range(1, 1000000);
$array1 = range(1, 10);

$start = microtime(true);
$result = [];
foreach ($array1 as $value1) {
    foreach ($array2 as $value2) {
        $result[] = $value1 * $value2;
    }
}
$end = microtime(true);
var_dump(count($result));
echo "duration:".($end - $start)."\n";
echo "memory:".memory_get_peak_usage(true)."\n";