php_performance

❯ cat fibo.php
<?php
$start = microtime(TRUE);

function fib($num) {
        if ($num <= 1) return 1;
        return fib($num -1) + fib($num -2);
}

$num = intval($argv[1]);
echo fib($num) . "\n";
$end = microtime(TRUE);

$diff = $end - $start;
echo "Elapsed: {$diff}s\n";

❯ docker run -it --rm -v $PWD:/app php:5.6-cli-alpine php /app/fibo.php 35
14930352
Elapsed: 7.9945681095123s

❯ docker run -it --rm -v $PWD:/app php:7.2-cli-alpine php /app/fibo.php 35
14930352
Elapsed: 1.7204959392548s

❯ docker run -it --rm -v $PWD:/app php:7.4-cli-alpine php /app/fibo.php 35
14930352
Elapsed: 1.4975919723511s

❯ docker run -it --rm -v $PWD:/app php:8.0.0RC4-cli-alpine php /app/fibo.php 35
14930352
Elapsed: 1.5452818870544s