[Hackaton 2024][Rhodium-Antimoine][PHP] EC2 - AvoidMultipleIfElseStatement

[Chmaqo]

Associated rule title

AvoidMultipleIfElseStatement : do not use multiple if, else if, else statements

Associated rule link
https://github.com/green-code-initiative/ecoCode/blob/main/ecocode-rules-specifications/src/main/rules/EC2/php/EC2.asciidoc

Language and platform

Language PHP
Platform : Lenovo T570
CPU : Intel(R) Core(TM) i5-7200U CPU @ 2.50GHz (x86_64)
RAM : 2133 MHz - 8GB

Measure justification

Using VJoule and 100000 runs on two samples (a good one and a bad one), here are the results :

Processing rule EC2 - language php
----------------------
RUNNING vjoule
TESTING good CASE

time    70ms673µs
PDU     0.00 J
CPU     0.46 J
RAM     0.04 J
GPU     0.00 J
----------------------
RUNNING vjoule
TESTING bad CASE


time    111ms312µs
PDU     0.00 J
CPU     0.79 J
RAM     0.05 J
GPU     0.00 J
----------------------

Validation

The measurement performed validates.

The percentage of certainty of this validation 95%, it is simple to reproduce using samples such as these ones :

/* GOOD PHP CASE */

<?php

function main() {
    $i = 15;
    $res = 0;
    switch ($i) {
        case 0:
            $res = 1;
            break;
        case 1:
            $res = 2;
            break;
        case 2:
            $res = 3;
            break;
        case 3:
            $res = 4;
            break;
        case 4:
            $res = 5;
            break;
        case 5:
            $res = 6;
            break;
        case 6:
            $res = 7;
            break;
        case 7:
            $res = 8;
            break;
        case 8:
            $res = 9;
            break;
        case 9:
            $res = 10;
            break;
        case 10:
            $res = 11;
            break;
        case 11:
            $res = 12;
            break;
        case 12:
            $res = 13;
            break;
        case 13:
            $res = 14;
            break;
        case 14:
            $res = 15;
            break;
        case 15:
            $res = 16;
            break;
    }
    return $res;
}

for ($i = 1; $i <= 1000000; $i++) {
    main();
}

?>

/* BAD PHP CASE */

<?php

function main() {
    $i = 15;
    $res = 0;

    if ($i == 0) {
        $res = 1;
    } elseif ($i == 1) {
        $res = 2;
    } elseif ($i == 2) {
        $res = 3;
    } elseif ($i == 3) {
        $res = 4;
    } elseif ($i == 4) {
        $res = 5;
    } elseif ($i == 5) {
        $res = 6;
    } elseif ($i == 6) {
        $res = 7;
    } elseif ($i == 7) {
        $res = 8;
    } elseif ($i == 8) {
        $res = 9;
    } elseif ($i == 9) {
        $res = 10;
    } elseif ($i == 10) {
        $res = 11;
    } elseif ($i == 11) {
        $res = 12;
    } elseif ($i == 12) {
        $res = 13;
    } elseif ($i == 13) {
        $res = 14;
    } elseif ($i == 14) {
        $res = 15;
    } elseif ($i == 15) {
        $res = 16;
    } else {
        $res = 17;
    }
    return $res;
}

for ($i = 1; $i <= 1000000; $i++) {
    main();
}

?>

[dedece35]

please, check this GCI2 rule for PHP with the two other tools :

• code carbon : https://github.com/mlco2/codecarbon
• energy tracer : https://github.com/green-code-initiative/EnergyTracer