PHP StartsWith and EndsWith Function Benchmarks

startswith-endswith-benchmark.php

<?php
/**
 * PHP StartsWith and EndsWith Function Benchmarks
 *
 * Function implementations taken from:
 * https://stackoverflow.com/q/834303/87015
 *
 * Command line:
 * php.exe -d memory_limit=128M startswith-endswith-benchmark.php
 */
php_sapi_name() === 'cli' or die;
define('NUMBER_OF_TESTS', 10000);
define('HAYSTACK_LENGTH', 8192);
function generateTests($count, $maxlen) {
	$tests = array();
	for ($i = 0; $i < $count; $i++) {
		$haystackLength = rand(1, $maxlen);
		$haystack = openssl_random_pseudo_bytes($haystackLength);
		$needleLength = rand(1, $haystackLength);
		$substr_s = substr($haystack, 0, $needleLength);
		$substr_e = substr($haystack, -$needleLength);
		$resultType = rand(0, 2);
		if ($resultType === 0) {
			$needle_s = $substr_s;
			$needle_e = $substr_e;
		}
		if ($resultType === 1) {
			while (($needle_s = openssl_random_pseudo_bytes($needleLength)) === $substr_s);
			while (($needle_e = openssl_random_pseudo_bytes($needleLength)) === $substr_e);
		}
		if ($resultType === 2) {
			$tokeep = rand(0, $needleLength - 1);
			while (($needle_s = substr($substr_s, 0, $tokeep) . openssl_random_pseudo_bytes($needleLength - $tokeep)) === $substr_s);
			while (($needle_e = substr($substr_e, 0, $tokeep) . openssl_random_pseudo_bytes($needleLength - $tokeep)) === $substr_e);
		}
		$tests[] = array('haystack' => $haystack, 'needle_s' => $needle_s, 'needle_e' => $needle_e, 'result' => $resultType === 0);
	}
	return $tests;
}
function startsWith_strpos($haystack, $needle) {
	return $needle === '' || strrpos($haystack, $needle, -strlen($haystack)) !== false;
}
function endsWith_strpos($haystack, $needle) {
	return ($needle === '') || (($spos = strlen($haystack) - strlen($needle)) >= 0 && strpos($haystack, $needle, $spos) !== false);
}
function startsWith_substr($haystack, $needle) {
	return substr($haystack, 0, strlen($needle)) === $needle;
}
function endsWith_substr($haystack, $needle) {
	return $needle === '' || substr($haystack, -strlen($needle)) === $needle;
}
function startsWith_substrcompare($haystack, $needle) {
	return substr_compare($haystack, $needle, 0, strlen($needle)) === 0;
}
function endsWith_substrcompare($haystack, $needle) {
	return substr_compare($haystack, $needle, -strlen($needle)) === 0;
}
$functions = array();
$functions['s']['startsWith_strpos'] = 0.0;
$functions['e']['endsWith_strpos'] = 0.0;
$functions['s']['startsWith_substr'] = 0.0;
$functions['e']['endsWith_substr'] = 0.0;
$functions['s']['startsWith_substrcompare'] = 0.0;
$functions['e']['endsWith_substrcompare'] = 0.0;
echo 'Using PHP ' . PHP_VERSION . '...' . PHP_EOL;
echo 'Generating tests...' . PHP_EOL;
$tests = generateTests(NUMBER_OF_TESTS, HAYSTACK_LENGTH);
echo 'Checking functions...' . PHP_EOL;
foreach ($functions['s'] as $function => $time) {
	foreach ($tests as $test) {
		$result = $function($test['haystack'], $test['needle_s']);
		if ($result !== $test['result']) {
			die('Function ' . $function . ' failed tests');
		}
	}
}
foreach ($functions['e'] as $function => $time) {
	foreach ($tests as $test) {
		$result = $function($test['haystack'], $test['needle_e']);
		if ($result !== $test['result']) {
			die('Function ' . $function . ' failed tests');
		}
	}
}
echo 'Running benchmark, press CTRL+C to stop...' . PHP_EOL;
for ($i = 1; true; $i++) {
	foreach ($functions['s'] as $function => &$time) {
		$t1 = microtime(true);
		foreach ($tests as $test) {
			$result = $function($test['haystack'], $test['needle_s']);
		}
		$t2 = microtime(true);
		$time += $t2 - $t1;
	}
	unset($time);
	foreach ($functions['e'] as $function => &$time) {
		$t1 = microtime(true);
		foreach ($tests as $test) {
			$result = $function($test['haystack'], $test['needle_e']);
		}
		$t2 = microtime(true);
		$time += $t2 - $t1;
	}
	unset($time);
	if ($i % 10 === 0) {
		foreach ($functions as $temp) {
			foreach ($temp as $function => $time) {
				echo sprintf('%-32s %8s ms avg. per %d executions', $function, number_format($time * 1000 / $i, 2), count($tests)) . PHP_EOL;
			}
		}
		echo PHP_EOL;
	}
}

return $haystack[-1] === $needle[-1]
    ? \substr_compare($haystack, $needle, -\strlen($needle)) === 0
    : false;

is faster