Benchmarking array_key_last php function from version 7.3. | Script based on http://www.php-benchmark-script.com

benchmark_outputs.txt

--------------------------------------------------- 
|              PHP BENCHMARK SCRIPT               | 
---------------------------------------------------
 Start : 2018-08-23 08:37:29
 PHP version : 7.3.0beta2
 Platform : Linux
 Each test executed 10000 times
---------------------------------------------------
 test_array_reverse                   650.660 sec.
 test_array_key_last                    0.049 sec.
 test_array_key_last_polyfill         216.517 sec.
---------------------------------------------------
 Total time                           867.228 sec.


---------------------------------------------------
|              PHP BENCHMARK SCRIPT               |
---------------------------------------------------
 Start: 2018-08-23 09:02:07
 PHP version: 7.3.0beta2
 Platform: Linux
 Each test is executed 100000 times
---------------------------------------------------
 test_array_key_last                    2.726 sec.
 test_array_key_last_polyfill         791.382 sec.
 test_array_reverse                 1,585.311 sec.
---------------------------------------------------
 Total time                         2,379.420 sec.
 
 
 ---------------------------------------------------
|              PHP BENCHMARK SCRIPT               |
---------------------------------------------------
 Start: 2018-08-23 09:03:10
 PHP version: 7.3.0beta2
 Platform: Linux
 Each test is executed 100000 times
---------------------------------------------------
 test_array_key_last                    2.880 sec.
 test_array_key_last_polyfill           827.293 sec.
 test_array_reverse                     1,650.330 sec.
---------------------------------------------------
 Total time                             2,480.503 sec.

benchmark_script.php

<?php

const PROGRESS = true;

$arrayToTest = range(1, 250000);

function array_key_last_polyfill(array $array) { $key = null; foreach ($array as $key => $value); return $key; }

class tests
{
    public static function test_array_key_last()
    {
        global $arrayToTest;
        $key = array_key_last($arrayToTest);
    }

    public static function test_array_key_last_polyfill()
    {
        global $arrayToTest;
        $key = array_key_last_polyfill($arrayToTest);
    }

    public static function test_array_reverse()
    {
        global $arrayToTest;
        $rev = array_reverse($arrayToTest, true);
        end($rev);
        $key = key($rev);
    }
}

class benchmarker
{
    private const COUNT = 100000;

    /**
     * This is just the script that will run the benchmark.
     */
    public static function run()
    {
        $total = 0;

        $methodText = "Executing %s... %d/%d\r";

        $line = str_pad('-', 51, '-');

        echo "$line\n|"
            .str_pad('PHP BENCHMARK SCRIPT', 49, ' ', STR_PAD_BOTH)."|\n".
            "$line\n".
            ' Start: '.date('Y-m-d H:i:s')."\n".
            ' PHP version: '.PHP_VERSION."\n".
            ' Platform: '.PHP_OS."\n".
            ' Each test is executed '.self::COUNT." times\n".
            "$line\n"
        ;

        foreach (get_class_methods(tests::class) as $method) {
            $time_start = microtime(true);
            if (!PROGRESS) {
                printf(' Executing %s...', $method);
            }
            for ($i = 1; $i <= self::COUNT; $i++) {
                if (PROGRESS) {
                    printf($methodText, $method, $i, self::COUNT);
                }
                tests::$method();
            }
            $result = microtime(true) - $time_start;
            $total += $result;
            echo str_pad(" $method".' ', 40).str_pad(number_format($result, 3).' sec.', 10, ' ', STR_PAD_LEFT).
                str_pad('', strlen($methodText) + strlen((string) self::COUNT) * 2 + strlen($method) + 4, ' ').
                "\r\n"
            ;
        }

        echo
            "$line\n".
            str_pad(' Total time', 40).number_format($total, 3).' sec.'
        ;
    }
}

benchmarker::run();