tedd wrote: > There are significant orders of magnitude difference between your results > and mine. > For example, it didn't make any difference if you used a comma or > concatenation, but in my system concatenation was 15 times faster than using > a comma. Interesting, I would have guessed it would have been the other way > around.
I refined the test, so that it is more random and therefore maybe more accurate. Test Results Results for 2048 cycles of echoing a 32-character string with a random 32-character string 2048 times: comma Method Number of Echoes: 536 Total time: 1.57938525391 milliseconds Average time: 0.00294661427968 milliseconds concat Method Number of Echoes: 537 Total time: 2.64919824219 milliseconds Average time: 0.00493333005994 milliseconds interpol Method Number of Echoes: 480 Total time: 4.38319873047 milliseconds Average time: 0.00913166402181 milliseconds heredoc Method Number of Echoes: 495 Total time: 3.66322021484 milliseconds Average time: 0.00740044487847 milliseconds Results for echoing 128 random 32-character string 2048 times: comma Method Number of Echoes: 536 Total time: 817.227 milliseconds Average time: 1.52467723881 milliseconds concat Method Number of Echoes: 537 Total time: 826.971 milliseconds Average time: 1.53998324022 milliseconds interpol Method Number of Echoes: 480 Total time: 3764.781 milliseconds Average time: 7.84329375 milliseconds heredoc Method Number of Echoes: 495 Total time: 540.391 milliseconds Average time: 1.0916989899 milliseconds ------------------------------------------------------------------------------ For all those who want to try it out, here is the code: ------------------------------------------------------------------------------ <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd";> <html xmlns="http://www.w3.org/1999/xhtml";> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>Test for Tedd</title> </head> <body style="font-size: small;"> <h1>Test Results</h1> <?php global $iterations, $results, $test_string; $iterations = 2048; $iterations2 = 128; // iterations for 2nd test $results1 = array( "comma" => array("total_time" => 0, "count" => 0), "concat" => array("total_time" => 0, "count" => 0), "interpol" => array("total_time" => 0, "count" => 0), "heredoc" => array("total_time" => 0, "count" => 0) ); $results2 = $results1; $test_array = array(); $test_string = md5(time()); // a 32 character string $eval_strings = create_eval_strings(); for ($i = 0; $i < $iterations; ++$i) $test_array[] = str_shuffle($test_string); // random strings for ($i = 0; $i < $iterations; ++$i) test_method(rand(0,3)); function test_method($method) { $start_time = $end_time = 0; $test_array =& $GLOBALS['test_array']; $test_string =& $GLOBALS['test_string']; $eval_strings =& $GLOBALS['eval_strings']; for ($i = 0; $i < 10; ++$i) { $j = rand(0, $GLOBALS['iterations']); $test_array[$j] = str_shuffle($test_array[$j]); // change some arr vals to outsmart any php speedup/cache } $arr2 = array(); // array for 2nd test for ($i = 0; $i < $GLOBALS['iterations2']; ++$i) $arr2[] = $test_array[rand(0, $GLOBALS['iterations'])]; # 1st test will output # of iterations random strings # 2nd test will output a sequence of #iterations2 random strings switch ($method) { case 0: // comma # -----> TEST 1 <----- ob_start(); $start_time = microtime(true); foreach ($test_array as $array_value) { echo $test_string, $array_value; } $end_time = microtime(true); ob_end_clean(); $GLOBALS["results1"]["comma"]["total_time"] += abs($end_time - $start_time)*1000/$GLOBALS["iterations"]; ++$GLOBALS["results1"]["comma"]["count"]; # -----> TEST 2 <----- ob_start(); $start_time = microtime(true); eval($eval_strings['comma']); $end_time = microtime(true); ob_end_clean(); $GLOBALS["results2"]["comma"]["total_time"] += abs($end_time - $start_time)*1000; ++$GLOBALS["results2"]["comma"]["count"]; break 1; case 1: // concatenation # -----> TEST 1 <----- ob_start(); $start_time = microtime(true); foreach ($test_array as $array_value) { echo $test_string.$array_value; } $end_time = microtime(true); ob_end_clean(); $GLOBALS["results1"]["concat"]["total_time"] += abs($end_time - $start_time)*1000/$GLOBALS["iterations"]; ++$GLOBALS["results1"]["concat"]["count"]; # -----> TEST 2 <----- ob_start(); $start_time = microtime(true); eval($eval_strings['concat']); $end_time = microtime(true); ob_end_clean(); echo $eval_string."\n"; $GLOBALS["results2"]["concat"]["total_time"] += abs($end_time - $start_time)*1000; ++$GLOBALS["results2"]["concat"]["count"]; break 1; case 2: // interpolation # -----> TEST 1 <----- ob_start(); $start_time = microtime(true); foreach ($test_array as $array_value) { echo "{$test_string}{$array_value}"; } $end_time = microtime(true); ob_end_clean(); $GLOBALS["results1"]["interpol"]["total_time"] += abs($end_time - $start_time)*1000/$GLOBALS["iterations"]; ++$GLOBALS["results1"]["interpol"]["count"]; # -----> TEST 2 <----- ob_start(); $start_time = microtime(true); eval($eval_strings['interpol']); $end_time = microtime(true); ob_end_clean(); $GLOBALS["results2"]["interpol"]["total_time"] += abs($end_time - $start_time)*1000; ++$GLOBALS["results2"]["interpol"]["count"]; break 1; case 3: // heredoc # -----> TEST 1 <----- ob_start(); $start_time = microtime(true); foreach ($test_array as $array_value) { echo <<<TEST $test_string$array_value; TEST; } $end_time = microtime(true); ob_end_clean(); $GLOBALS["results1"]["heredoc"]["total_time"] += abs($end_time - $start_time)*1000/$GLOBALS["iterations"]; ++$GLOBALS["results1"]["heredoc"]["count"]; # -----> TEST 2 <----- ob_start(); $start_time = microtime(true); eval($eval_strings['heredoc']); $end_time = microtime(true); ob_end_clean(); $GLOBALS["results2"]["heredoc"]["total_time"] += abs($end_time - $start_time)*1000; ++$GLOBALS["results2"]["heredoc"]["count"]; break 1; } } function create_eval_strings() { // returns the eval strings for the 4 methods $strings = array(); $eval_string = 'echo'; // comma for ($i = 0; $i < $GLOBALS['iterations2']; ++$i) $eval_string .= ' $arr['.$i.'],'; $eval_string{strlen($eval_string) - 1} = ';'; $strings['comma'] = $eval_string; $eval_string = str_replace(', ', '.', $eval_string); // concatenation $strings['concat'] = $eval_string; $eval_string = 'echo "'; //interpolation for ($i = 0; $i < $GLOBALS['iterations2']; ++$i) $eval_string .= '{$arr['.$i.']}'; $eval_string .= '";'; $strings['interpol'] = $eval_string; $eval_string = "echo <<<TEST\n"; // heredoc for ($i = 0; $i < $GLOBALS['iterations2']; ++$i) $eval_string .= '$arr['.$i.']'; $eval_string .= "\nTEST;"; $strings['heredoc'] = $eval_string; return $strings; } function get_result(&$result) { $buffer = ""; foreach ($result as $key => $value) { $avg_time = $value['total_time']/$value['count']; $buffer .= " <h3>{$key} Method</h3> <p><strong>Number of Echoes:</strong> {$value['count']}</p> <p><strong>Total time:</strong> {$value['total_time']} milliseconds</p> <p><strong>Average time:</strong> {$avg_time} milliseconds</p> "; } return $buffer; } $result1 = get_result($results1); $result2 = get_result($results2); echo <<<RESULTS <h2>Results for $iterations cycles of echoing a 32-character string with a random 32-character string $iterations times:</h2> $result1 <h2>Results for echoing $iterations2 random 32-character string $iterations times:</h2> $result2 RESULTS; ?> </body> </html> ------------------------------------------------------------------------- Everybody is free to use, modify, ignore, optimize or whatever the code. -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
