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<?php function starts_with_strpos($haystack, $needle) { return strpos($haystack, $needle) === 0; } function starts_with_substr($haystack, $needle) { return substr($haystack, 0, strlen($needle)) === $needle; } // setup the haystack and needle $haystack = "Hello PHP"; $needle = "Hello"; // initialize the results array $results = array('substr' => array(), 'strpos' => array(), 'strpos_without_function' => array()); // exhaust the gc's threshhold at 10K $it = 10000; // Run the substr benchmark for($i = 0; $i < $it; $i++) { $t = microtime(true); starts_with_substr($haystack, $needle); $results['substr'][] = microtime(true) - $t; } // discard the first and last results as opline biased array_pop($results['substr']); array_shift($results['substr']); // Run the strpos benchmark for($i = 0; $i < $it; $i++) { $t = microtime(true); starts_with_strpos($haystack, $needle); $results['strpos'][] = microtime(true) - $t; } // discard the first and last results as opline biased array_pop($results['strpos']); array_shift($results['strpos']); // Run the strpos without a wrapper function benchmark for($i = 0; $i < $it; $i++) { $t = microtime(true); strpos($haystack, $needle) === 0; $results['strpos_without_function'][] = microtime(true) - $t; } // discard the first and last results as opline biased array_pop($results['strpos_without_function']); array_shift($results['strpos_without_function']); // compare the results $a = array_sum($results['substr']) / $it; $b = array_sum($results['strpos']) / $it; $c = array_sum($results['strpos_without_function']) / $it; printf("substr: %.9fs/iteration @ %d iterations\nstrpos: %.9fs/iteration @ %d iterations\nstrpos (without wrapper): %.9fs/iteration @ %d iterations\n\n", $a, $it, $b, $it, $c, $it); // determine which is faster (substr or strpos) if ($a > $b) { // substr is slower printf("strpos is %d%% faster than substr\n", $b / $a * 100); } elseif ($b > $a) { // strpos is slower printf("substr is %d%% faster than strpos\n", $a / $b * 100); } else { // they're the same printf("strpos and substr are the same\n"); } // determine which is faster (strpos with a wrapper or without) if ($b > $c) { // strpos wrapper is slower printf("strpos without a wrapper function is %d%% faster than strpos with a wrapper function\n", $c / $b * 100); } elseif ($c > $b) { // strpos wrapper is faster printf("strpos with a wrapper function is %d%% faster than strpos without a wrapper fucntion\n", $b / $c * 100); } else { // they're the same printf("strpos and substr are the same\n"); }

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