benchmark-startsWith-endsWith.php

<?php
namespace strpos {
    function startsWith($haystack, $needle) {
        return (strpos($haystack, $needle) === 0);
    }
    function endsWith($haystack, $needle) {
        return strrpos($haystack, $needle, 0) === strlen($haystack) - strlen($needle);
    }
}

namespace substr {
    function startsWith($haystack, $needle) {
        return substr($haystack, 0, strlen($needle)) === $needle;
    }
    function endsWith($haystack, $needle) {
        return substr($haystack, -strlen($needle)) === $needle;
    }
}

namespace strncmp {
    function startsWith($haystack, $needle) {
        return strncmp($haystack, $needle, strlen($needle)) === 0;
    }
    function endsWith($haystack, $needle) {
        $haystack = strrev($haystack);
        $needle = strrev($needle);
        return strncmp($haystack, $needle, strlen($needle)) === 0;
    }
}

namespace substr_compare {
    function startsWith($haystack, $needle) {
        return substr_compare($haystack, $needle, 0, strlen($needle)) === 0;
    }
    function endsWith($haystack, $needle) {
        return substr_compare($haystack, $needle, - strlen($needle)) === 0;
    }
}

namespace preg_match {
    function startsWith($haystack, $needle) {
        $needle = preg_quote($needle);
        return preg_match('/\\A' . $needle . '/', $haystack) !== 0;
    }
    function endsWith($haystack, $needle) {
        $needle = preg_quote($needle);
        return preg_match('/' . $needle . '\\z/', $haystack) !== 0;
    }
}

namespace {

    function test($ns)
    {
        $startsWith = "$ns\\startsWith";
        $endsWith = "$ns\\endsWith";

        assert($endsWith('abc', 'c') === true);
        assert($endsWith('abc', 'bc') === true);
        assert($endsWith('abc', 'abc') === true);
        assert($endsWith('abc', 'xabc') === false);
        assert($endsWith('abc', 'b') === false);
        assert($endsWith('abc', 'ab') === false);
    }

    function benchmark($ns)
    {
        gc_collect_cycles();

        $startsWith = "$ns\\startsWith";
        $endsWith = "$ns\\endsWith";

        $str = str_repeat("abc", 1024*1024*20);
        $needle = "xxx";

        $nums = [];

        $t = microtime(true) + 1;
        for ($i=0; microtime(true) < $t; $i++) {
            $startsWith($needle, $needle);
        }
        $nums[] = $i;

        $t = microtime(true) + 1;
        for ($i=0; microtime(true) < $t; $i++) {
            $startsWith($str, $needle);
        }
        $nums[] = $i;

        $t = microtime(true) + 1;
        for ($i=0; microtime(true) < $t; $i++) {
            $endsWith($needle, $needle);
        }
        $nums[] = $i;

        $t = microtime(true) + 1;
        for ($i=0; microtime(true) < $t; $i++) {
            $endsWith($str, $needle);
        }
        $nums[] = $i;

        printf("%-20s %8d %8d %8d %8d\n", $ns, ...$nums);
    }

    test('strpos');
    test('substr');
    test('strncmp');
    test('substr_compare');
    test('preg_match');

    printf("%-20s %8s %8s %8s %8s\n", "", 's:ok', 's:ng', 'e:ok', 'e:ng');

    benchmark('strpos');
    benchmark('substr');
    benchmark('strncmp');
    benchmark('substr_compare');
    benchmark('preg_match');
}

result.txt

                         s:ok     s:ng     e:ok     e:ng
strpos                 310957      214   219756       13
substr                 241258   251368   251819   255437
strncmp                240180   219722   163450       12
substr_compare         238999   249039   246748   250033
preg_match             210192   220656   224138       11