www-tests/promises/lib.php

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<?php
namespace Lib;
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/*
php.ini
precision = 16
bcmath.scale = 6
*/
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function microtime_calc(): array
{
static $last = null; // 1st time
static $sum = 0.0; // 1st time
$mt = microtime(true);
$diff = is_null($last)? 0.0: bcsub($mt, $last);
$sum = bcadd($sum, $diff);
$last = $mt;
return [$sum, $diff];
}
function printf(string $str, ...$args): int
{
return \printf("∑%.6f +%.6f | ". $str."\n", ...microtime_calc(), ...$args);
}
function plain(): void
{
header('Content-Type: text/plain');
}