Compare explode with in_array vs mb_strpos

benchmark.php

<?php

define('ITERATIONS', 1000 * 1000);

function microtime_float()
{
    list($usec, $sec) = explode(" ", microtime());
    return ((float)$usec + (float)$sec);
}

function keywordsWithoutMatch()
{
    return "value1|value2|cat|dog|Plan du scénario|Plan du Scénario";
}

function keywordsWithMatch()
{
    return "test|Lëtzebuergesch|Forgatókönyv|Pirate";
}

$native = "Pirate";


function benchmarkInArray($native)
{
    for ($i = 0; $i < ITERATIONS; $i++) {
        $keywordTypes = array(
            'Given' => explode('|', keywordsWithoutMatch()),
            'When' => explode('|', keywordsWithoutMatch()),
            'Then' => explode('|', keywordsWithoutMatch()),
            'And' => explode('|', keywordsWithoutMatch()),
            'But' => explode('|', keywordsWithMatch())
        );
        foreach ($keywordTypes as $type => $keywords) {
            if (in_array($native, $keywords) || in_array($native . '<', $keywords)) {
                if ($type != 'But') throw new Exception();
                break;
            }
        }
    }
}

function benchmarkInArrayWithCache($native)
{
    $keywordTypes = array(
        'Given' => explode('|', keywordsWithoutMatch()),
        'When' => explode('|', keywordsWithoutMatch()),
        'Then' => explode('|', keywordsWithoutMatch()),
        'And' => explode('|', keywordsWithoutMatch()),
        'But' => explode('|', keywordsWithMatch())
    );
    for ($i = 0; $i < ITERATIONS; $i++) {
        foreach ($keywordTypes as $type => $keywords) {
            if (in_array($native, $keywords) || in_array($native . '<', $keywords)) {
                if ($type != 'But') throw new Exception();
                break;
            }
        }
    }
}

function benchmarkMbStrpos($native)
{
    for ($i = 0; $i < ITERATIONS; $i++) {
        $keywordTypes = array(
            'Given' => keywordsWithoutMatch(),
            'When' => keywordsWithoutMatch(),
            'Then' => keywordsWithoutMatch(),
            'And' => keywordsWithoutMatch(),
            'But' => keywordsWithMatch()
        );
        foreach ($keywordTypes as $type => $keywords) {
            if (false !== mb_strpos($keywords, $native)) {
                if ($type != 'But') throw new Exception();
                break;
            }
        }
    }
}


function benchmarkMbStrposWithCache($native)
{

    $keywordTypes = array(
        'Given' => keywordsWithoutMatch(),
        'When' => keywordsWithoutMatch(),
        'Then' => keywordsWithoutMatch(),
        'And' => keywordsWithoutMatch(),
        'But' => keywordsWithMatch()
    );
    for ($i = 0; $i < ITERATIONS; $i++) {
        foreach ($keywordTypes as $type => $keywords) {
            if (false !== mb_strpos($keywords, $native)) {
                if ($type != 'But') throw new Exception();
                break;
            }
        }
    }
}


$time_start = microtime_float();
benchmarkInArray($native);
echo "benchmark in_array:             " . (microtime_float() - $time_start) . "\n";


$time_start = microtime_float();
benchmarkInArrayWithCache($native);
echo "benchmark in_array with cache:  " . (microtime_float() - $time_start) . "\n";


$time_start = microtime_float();
benchmarkMbStrpos($native);
echo "benchmark mb_strpos:            " . (microtime_float() - $time_start) . "\n";


$time_start = microtime_float();
benchmarkMbStrposWithCache($native);
echo "benchmark mb_strpos with cache: " . (microtime_float() - $time_start) . "\n";

result

// PHP 5.4.24 (cli)
benchmark in_array:             8.2751109600067
benchmark in_array with cache:  3.9663600921631
benchmark mb_strpos:            12.01834821701
benchmark mb_strpos with cache: 10.596436023712