note 75508 added to function.microtime

I ran my own tests based on five of the functions here to emulate the PHP5 behavior on PHP4. As always, these aren't needed on PHP5, but I was intrested in which one would run most quickly. My results are as follows: Function 1 (example): performs at 1x for these results Function 2 (posted by yhoko): performs at about 1.033x Function 3 (posted by james): performs at about 1.031x Function 4 (posted by emuxperts admin/m0sh3) performs at about 0.945x Function 5 (posted by Z0d): performs at about 1.103x So if you're concerned about peformance, consider the use of the strtok() function as Z0d used. Most of us, however, aren't going to need that sort of speed in a microtime function. In a test of 1 million iterations, it saved about 1.3 seconds. I'm not sure of many php applications that would use microtime that extensively. If so, how many of those microtimes is the float value actually needed. I ran this test many times in different orders (modify the $functions var) and many times. Here is the output I used for these results: Function [float_microtime_1] Total Time: 13.6581590175628662 Function [float_microtime_1] Average Time: 0.0000136581590176 Function [float_microtime_2] Total Time: 13.2114200592041016 Function [float_microtime_2] Average Time: 0.0000132114200592 Function [float_microtime_3] Total Time: 13.2385060787200928 Function [float_microtime_3] Average Time: 0.0000132385060787 Function [float_microtime_4] Total Time: 14.4395959377288836 Function [float_microtime_4] Average Time: 0.0000144395959377 Function [float_microtime_5] Total Time: 12.3734378814697266 Function [float_microtime_5] Average Time: 0.0000123734378815 Here's my test script: <?php function float_microtime_1() { list($usec, $sec) = explode(" ", microtime()); return ((float)$usec + (float)$sec); } function float_microtime_2() { $time = microtime(); return (double)substr( $time, 11 ) + (double)substr( $time, 0, 8 ); } function float_microtime_3() { return array_sum(explode(' ',microtime())); } function float_microtime_4() { return (float)preg_replace('#^0\.([0-9]+) ([0-9]+)$#', '\2.\1', microtime()); } function float_microtime_5() { return strtok(microtime(), ' ') + strtok(''); } // settings for benchmark. $functions = array( 'float_microtime_5', 'float_microtime_1', 'float_microtime_2', 'float_microtime_3', 'float_microtime_4', ); $amount = 1000000; set_time_limit(0); // actual benchmark $count = count($keys); if($count > 0) { // first get the functions in memory or w/e... sortof foreach($functions as $function) { $value = $function(); } // run the test foreach($functions as $function) { $times = $amount; $start[$function] = microtime(); while(--$times) { $value = $function(); } $stop[$function] = microtime(); } foreach($functions as $function) { $start_time = strtok($start[$function], ' ') + strtok(''); $stop_time = strtok($stop[$function], ' ') + strtok(''); $total_time = $stop_time - $start_time; $average_time = $total_time / $amount; echo 'Function [' . $function . '] Total Time: ' . number_format($total_time, 16) . chr(10); echo 'Function [' . $function . '] Average Time: '. number_format($average_time, 16) . chr(10); } } else { echo 'No Tests to run.'; } ?> ---- Server IP: 64.71.164.2 Probable Submitter: 69.1.45.213 ---- Manual Page -- http://www.php.net/manual/en/function.microtime.php Edit -- https://master.php.net/note/edit/75508 Del: integrated -- https://master.php.net/note/delete/75508/integrated Del: useless -- https://master.php.net/note/delete/75508/useless Del: bad code -- https://master.php.net/note/delete/75508/bad+code Del: spam -- https://master.php.net/note/delete/75508/spam Del: non-english -- https://master.php.net/note/delete/75508/non-english Del: in docs -- https://master.php.net/note/delete/75508/in+docs Del: other reasons-- https://master.php.net/note/delete/75508 Reject -- https://master.php.net/note/reject/75508 Search -- https://master.php.net/manage/user-notes.php