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@ 2016-08-22T14:02:14Z

<?php

$b = 0;

function getUsage($b) {
    $f = 0.0335 + ($b / 100000);

    if ($b > 100) {
        $usageElectricityStart = 750;
    } else {
        $usageElectricityStart = round($b * 7.5);
    }

    $gas = round($b / $f * (0.25 + (4 * $b / 10000)), -1);
    $electricity = round($usageElectricityStart + $b / $f * 0.625, -1);

    return array('gas' => $gas, 'electricity' => $electricity);
}

$cases = array(
  1 => array('price' => 294, 'gas' => 2887, 'electricity' => 5789),
  2 => array('price' => 137, 'gas' => 1527, 'electricity' => 2620),
  3 => array('price' => 127, 'gas' => 750, 'electricity' => 3650),
  4 => array('price' => 139, 'gas' => 1227, 'electricity' => 3201),
  5 => array('price' => 230, 'gas' => 2555, 'electricity' => 4317),
  6 => array('price' => 79, 'gas' => 544, 'electricity' => 2339)
);

foreach ($cases as $caseKey => $caseItem) {
  echo 'CASE ' . $caseKey . ': ' . $caseItem['price'] .' EUR' . "\n";
  echo 'actual gas: ' . $caseItem['gas'] . ' m3' . "\n";
  echo 'actual electricity: ' . $caseItem['electricity'] . ' kWh' . "\n";

  $calculatedUsage = getUsage($caseItem['price']);

  echo 'calculated gas: ' . $calculatedUsage['gas'] . ' m3' . "\n";
  echo 'calculated electricity: ' . $calculatedUsage['electricity'] . ' kWh' . "\n\n";

  echo 'gas relative to actual: ' . round($calculatedUsage['gas'] / $caseItem['gas'] * 100, 2) . ' %' . "\n";
  echo 'electricity relative to actual: ' . round($calculatedUsage['electricity'] / $caseItem['electricity'] * 100, 2) . ' %' . "\n\n\n";
}

Output for git.master, git.master_jit, rfc.property-hooks: CASE 1: 294 EUR actual gas: 2887 m3 actual electricity: 5789 kWh calculated gas: 2970 m3 calculated electricity: 5790 kWh gas relative to actual: 102.87 % electricity relative to actual: 100.02 % CASE 2: 137 EUR actual gas: 1527 m3 actual electricity: 2620 kWh calculated gas: 1200 m3 calculated electricity: 3210 kWh gas relative to actual: 78.59 % electricity relative to actual: 122.52 % CASE 3: 127 EUR actual gas: 750 m3 actual electricity: 3650 kWh calculated gas: 1100 m3 calculated electricity: 3030 kWh gas relative to actual: 146.67 % electricity relative to actual: 83.01 % CASE 4: 139 EUR actual gas: 1227 m3 actual electricity: 3201 kWh calculated gas: 1220 m3 calculated electricity: 3240 kWh gas relative to actual: 99.43 % electricity relative to actual: 101.22 % CASE 5: 230 EUR actual gas: 2555 m3 actual electricity: 4317 kWh calculated gas: 2200 m3 calculated electricity: 4770 kWh gas relative to actual: 86.11 % electricity relative to actual: 110.49 % CASE 6: 79 EUR actual gas: 544 m3 actual electricity: 2339 kWh calculated gas: 650 m3 calculated electricity: 2030 kWh gas relative to actual: 119.49 % electricity relative to actual: 86.79 %

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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