note 94512 added to function.microtime

<?php function endswith1($s, $e) { return ( substr($s, strlen($s) - strlen($e)) == $e ); } function endswith2($s, $e) { $e = preg_quote($e); return preg_match("/($e)$/", $s); } function control($s, $e) {return null;} function timereps($func, $reps) { $s = "path/to/file/somefile.csv"; $e = ".csv"; $t1 = microtime(true); for ($i = 0; $i< $reps; $i++) { $dmy = $func($s, $e); } $t2 = microtime(true); return $t2 - $t1; } print "substr time: ".($e1 = timereps('endswith1', 370000))."\n"; print "preg_match time: ".($e2 = timereps('endswith2', 370000))."\n"; print "control time: ".($ct = timereps('control', 370000))."\n"; print "preg_match vs substr: ".(100.0 * (($e2-$ct) / ($e1-$ct)))."\n"; ?> When I run the above, I get widely varying results, but most of the results show the substr/strlen version outperforming the preg_match version by between about 30 to 40% if separated out into a dedicated function call, or 70 to 80% if done in-line (if I take out the time it takes to make a function call): substr time: 0.66379904747009 preg_match time: 0.91860914230347 control time: 0.32123684883118 preg_match vs substr: 174.38359978007 Both, however, on my (relatively high powered) office desktop, can fairly reliably be done 370,000 times or more in one second, so, the slower performance of preg_match may be a non-issue in the vast majority of cases. ---- Server IP: 69.147.83.197 Probable Submitter: 173.11.31.153 ---- Manual Page -- http://www.php.net/manual/en/function.microtime.php Edit -- https://master.php.net/note/edit/94512 Del: integrated -- https://master.php.net/note/delete/94512/integrated Del: useless -- https://master.php.net/note/delete/94512/useless Del: bad code -- https://master.php.net/note/delete/94512/bad+code Del: spam -- https://master.php.net/note/delete/94512/spam Del: non-english -- https://master.php.net/note/delete/94512/non-english Del: in docs -- https://master.php.net/note/delete/94512/in+docs Del: other reasons-- https://master.php.net/note/delete/94512 Reject -- https://master.php.net/note/reject/94512 Search -- https://master.php.net/manage/user-notes.php