php benchmark

benchmark.php

<?php

// define benchmarked functions

$f1 = function ($string, $delimiter = ',', $trim = true, $skipEmpty = false) {
    $result = [];
    $parts = explode($delimiter, $string);
    foreach ($parts as $value) {
        if ($trim) {
            $value = $trim === true ? trim($value) : (is_callable($trim) ? $trim($value) : trim($value, $trim));
        }
        if ($skipEmpty && $value === '') {
            continue;
        }
        $result[] = $value;
    }
    return $result;
};

$f2 = function ($string, $delimiter = ',', $trim = true, $skipEmpty = false) {
    $result = explode($delimiter, $string);
    if ($trim) {
        $result = array_map($trim === true ? 'trim' : (is_callable($trim) ? $trim : function($v)use($trim){return trim($v, $trim);}), $result);
    }
    if ($skipEmpty) {
        $result = array_filter($result);
    }
    return $result;
};

$f3 = function ($string, $delimiter = ',', $trim = true, $skipEmpty = false) {
    if ($skipEmpty) {
        if ($trim) {
            return array_filter(array_map($trim === true ? 'trim' : (is_callable($trim) ? $trim : function($v)use($trim){return trim($v, $trim);}), explode($delimiter, $string)));
        }
        return array_filter(explode($delimiter, $string));
    }
    if ($trim) {
        return array_map($trim === true ? 'trim' : (is_callable($trim) ? $trim : function($v)use($trim){return trim($v, $trim);}), explode($delimiter, $string));
    }
    return explode($delimiter, $string);
};

// setup benchmark params

$iterations = 100000;
$arguments = array(
    '  trim   empty' => array('abc,def,iijaef9,13498 ,aef 981341, 98afja ,,Здесь строка , , ,, ', ',', true, false),
    'notrim   empty' => array('abc,def,iijaef9,13498 ,aef 981341, 98afja ,,Здесь строка , , ,, ', ',', false, false),
    '  trim noempty' => array('abc,def,iijaef9,13498 ,aef 981341, 98afja ,,Здесь строка , , ,, ', ',', true, true),
    'notrim noempty' => array('abc,def,iijaef9,13498 ,aef 981341, 98afja ,,Здесь строка , , ,, ', ',', false, true),
);
$functions = array(
    'original'         => $f1,
    'array_*'          => $f2,
    'array_* w/o vars' => $f3,
);
$checkValues = false;

// run benchmark

$benchmark = function ($callable, $arguments, $iterations = 100000) {
    $start_time = microtime(TRUE);

    for($i = 0; $i < $iterations; $i++) {
        $value = call_user_func_array($callable, $arguments);
    }

    $end_time = microtime(TRUE);

    $total_time = $end_time - $start_time;

    return array($value, $total_time);
};

$results = array();
$previous = null;
foreach($arguments as $arguments_name => $argument) {
    foreach($functions as $function_name => $function) {
        list($value, $time) = $benchmark($function, $argument);
        if ($checkValues && $previous !== null && $previous !== $value) {
            echo "error: $function_name ($arguments_name) returned different results:\n";
            var_dump($previous, $value);
        }
        $previous = $value;

        $results[$function_name] = $time;
    }
    // print results

    asort($results);
    $min_time = reset($results);

    echo "$arguments_name:\n";
    foreach($results as $name => $time) {
        echo str_pad($name.": ", 25, ' ', STR_PAD_LEFT).$time.' ('.(number_format(100*$time/$min_time, 2)).'%)'."\n";
    }
}

echo "\nPerformed $iterations iterations.\n\n";