bench_utf8_regex.php

<?php

const UTF8_REGEX = '/\A(?:
          [\x00-\x7F]++                      # ASCII
        | [\xC2-\xDF][\x80-\xBF]             # non-overlong 2-byte
        |  \xE0[\xA0-\xBF][\x80-\xBF]        # excluding overlongs
        | [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}  # straight 3-byte
        |  \xED[\x80-\x9F][\x80-\xBF]        # excluding surrogates
        |  \xF0[\x90-\xBF][\x80-\xBF]{2}     # planes 1-3
        | [\xF1-\xF3][\x80-\xBF]{3}          # planes 4-15
        |  \xF4[\x80-\x8F][\x80-\xBF]{2}     # plane 16
        )*+\z/x';

const NON_UTF8_REGEX = '/(
        [\xC0-\xC1] # Invalid UTF-8 Bytes
        | [\xF5-\xFF] # Invalid UTF-8 Bytes
        | \xE0[\x80-\x9F] # Overlong encoding of prior code point
        | \xF0[\x80-\x8F] # Overlong encoding of prior code point
        | [\xC2-\xDF](?![\x80-\xBF]) # Invalid UTF-8 Sequence Start
        | [\xE0-\xEF](?![\x80-\xBF]{2}) # Invalid UTF-8 Sequence Start
        | [\xF0-\xF4](?![\x80-\xBF]{3}) # Invalid UTF-8 Sequence Start
        | (?<=[\x0-\x7F\xF5-\xFF])[\x80-\xBF] # Invalid UTF-8 Sequence Middle
        | (?<![\xC2-\xDF]|[\xE0-\xEF]|[\xE0-\xEF][\x80-\xBF]|[\xF0-\xF4]|[\xF0-\xF4][\x80-\xBF]|[\xF0-\xF4][\x80-\xBF]{2})[\x80-\xBF] # Overlong Sequence
        | (?<=[\xE0-\xEF])[\x80-\xBF](?![\x80-\xBF]) # Short 3 byte sequence
        | (?<=[\xF0-\xF4])[\x80-\xBF](?![\x80-\xBF]{2}) # Short 4 byte sequence
        | (?<=[\xF0-\xF4][\x80-\xBF])[\x80-\xBF](?![\x80-\xBF]) # Short 4 byte sequence (2)
    )/x';


function utf8($n, $str) {
    for ($i = 0; $i < $n; ++$i) {
        \preg_match(UTF8_REGEX, $str);
    }
}

function non_utf8($n, $str) {
    for ($i = 0; $i < $n; ++$i) {
        \preg_match(NON_UTF8_REGEX, $str);
    }
}

function empty_loop($n, $str) {
    for ($i = 0; $i < $n; ++$i) {
    }
}

function getmicrotime()
{
    $t = gettimeofday();
    return ($t['sec'] + $t['usec'] / 1000000);
}

function start_test()
{
    ob_start();
    return getmicrotime();
}

function end_test($start, $name, $overhead = null)
{
    global $total;
    global $last_time;
    $end = getmicrotime();
    ob_end_clean();
    $last_time = $end-$start;
    $total += $last_time;
    $num = number_format($last_time,3);
    $pad = str_repeat(" ", 24-strlen($name)-strlen($num));
    if (is_null($overhead)) {
        echo $name.$pad.$num."\n";
    } else {
        $num2 = number_format($last_time - $overhead,3);
        echo $name.$pad.$num."    ".$num2."\n";
    }
    ob_start();
    return getmicrotime();
}

function total()
{
    global $total;
    $pad = str_repeat("-", 24);
    echo $pad."\n";
    $num = number_format($total,3);
    $pad = str_repeat(" ", 24-strlen("Total")-strlen($num));
    echo "Total".$pad.$num."\n";
}

const N = 500000;
$str = str_repeat('c', 65535);

$t0 = $t = start_test();
empty_loop(N, $str);
$t = end_test($t, 'empty_loop');
$overhead = $last_time;

utf8(N, $str);
$t = end_test($t, 'utf8', $overhead);

non_utf8(N, $str);
$t = end_test($t, 'non_utf8', $overhead);

total();

output.txt

$ php -d pcre.jit=1 tests/bench_utf8_regex.php
empty_loop         0.004
utf8              14.833    14.829
non_utf8          14.713    14.709
------------------------
Total             29.550


$ php -d pcre.jit=0 tests/bench_utf8_regex.php
empty_loop         0.004
utf8              81.329    81.325
^C

$ php -v
PHP 7.0.5 (cli) (built: Apr 23 2016 10:48:01) ( NTS )
Copyright (c) 1997-2016 The PHP Group
Zend Engine v3.0.0, Copyright (c) 1998-2016 Zend Technologies
    with Zend OPcache v7.0.6-dev, Copyright (c) 1999-2016, by Zend Technologies