bitwise-wins.php

<?php
echo "preparing test data file\n";
if (!file_exists('tmp')) {
    $s = '';
    for ($i = 0; $i < 1000000; $i++) {
        $s .= rand() . 'asd';
    }
    file_put_contents('tmp', $s);
    echo "file generated\n";
} else
    echo "file already exists\n";
echo "test data prepared\n";
function bstr2bin($input)
{
    if (!is_string($input)) {
        return null;
    }

    $value = unpack('H*', $input);
    return base_convert($value[1], 16, 2);
}

$s = file_get_contents('tmp');
$s_len = strlen($s);
echo "test 1 start\n";
$t1 = microtime(true);
$calc = 0;
for ($i = 0; $i < $s_len; $i += 2) {
    $calc += array_sum(str_split(bstr2bin(substr($s, $i, 2))));
}
var_dump($calc, round((microtime(true) - $t1), 5) . 's');
var_dump($calc);


echo "test 2 start\n";
$t1 = microtime(true);
$calc = 0;
$map = [];
for ($i = 0; $i < $s_len; $i += 1024) {
    foreach (str_split(substr($s, $i, 1024)) as $cur) {
        if (@$map[$cur])
            $map[$cur] = $map[$cur] + 1;
        else
            $map[$cur] = 1;
    }
}
foreach ($map as $cur => $val) {
    $calc += array_sum(str_split(bstr2bin((string)$cur))) * $val;
}
var_dump($calc, round((microtime(true) - $t1), 5) . 's');
var_dump($calc);


echo "test 3 start\n";
$t1 = microtime(true);
$calc = 0;
foreach (count_chars($s, 1) as $cur => $val) {
    $calc += array_sum(str_split(bstr2bin(chr($cur)))) * $val;
}
var_dump($calc, round((microtime(true) - $t1), 5) . 's');
var_dump($calc);


echo "test 4 start\n";
$calc = 0;
$t1 = microtime(true);
foreach (count_chars($s, 1) as $i => $v) {
    $calc += (($i & 1) + (($i >> 1) & 1) + (($i >> 2) & 1) + (($i >> 3) & 1) + (($i >> 4) & 1) + (($i >> 5) & 1) + (($i >> 6) & 1) + (($i >> 7) & 1)) * $v;
}
var_dump($calc, round((microtime(true) - $t1), 5) . 's');
var_dump($calc);