<?php
$fStartPHP=microtime(true);
$sWord = ' TestString ';
/* Time preg_replace trim double quotes */
$fStartPreg=microtime(true);
$sPreg=preg_replace("/^\s+|\s+$/", "", $sWord);
$fEndPreg=microtime(true);
/* Time preg_replace trim single quotes */
$fStartPregSng=microtime(true);
$sPreg=preg_replace('/^\s+|\s+$/', '', $sWord);
$fEndPregSng=microtime(true);
/* Time trim */
$fStartTrim=microtime(true);
$sTrim=trim($sWord);
$fEndTrim=microtime(true);
/* Calculate elapsed times */
$fPregElapsed=$fEndPreg-$fStartPreg;
$fPregElapsedSng=$fEndPregSng-$fStartPregSng;
$fTrimElapsed=$fEndTrim-$fStartTrim;
/* Display output */
echo '<html>';
echo '<script>var d=new Date();var jsStart=d.getTime();var jsEnd;</script>';
echo '<script>function EndLoad(){var d=new Date();jsEnd=d.getTime();jsElapsed=jsEnd-jsStart;document.getElementById(\'jsStartDisplay\').innerHTML=jsStart;document.getElementById(\'jsEndDisplay\').innerHTML=jsEnd;document.getElementById(\'jsElapsedDisplay\').innerHTML=jsElapsed;}</script>';
echo '<body onload="EndLoad()">';
echo '<pre>';
echo htmlentities(file_get_contents('timetest.php'));
echo "\n\n";
echo '$sWord: -'.$sWord."-\n";
echo '$sPreg: -'.$sPreg."-\n";
echo '$sTrim: -'.$sTrim."-\n";
printf("preg_replace:\t%f<br />",$fPregElapsed);
printf("preg_replace:\t%f (single quotes)<br />",$fPregElapsedSng);
printf("trim:\t\t%f<br />",$fTrimElapsed);
printf("difference:\t%f<br />",$fPregElapsed-$fTrimElapsed);
echo '</pre>';
echo '</body>'."\n";
$fEndPHP=microtime(true);
$fPHPElapsed=$fEndPHP-$fStartPHP;
echo 'PHPStartTime: ';printf("%f",$fStartPHP);echo '<br />'."\n";
echo 'PHPEndTime: ';printf("%f",$fEndPHP);echo '<br />'."\n";
echo 'PHPElapsed: ';printf("%f",$fPHPElapsed*1000000);echo ' microseconds <br />'."\n";
echo '<hr />';
echo 'HTML/JSStartTime: <span id="jsStartDisplay"></span><br />'."\n";
echo 'HTML/JSEndTime: <span id="jsEndDisplay"></span><br />'."\n";
echo 'HTML/JSElapsedTime: <span id="jsElapsedDisplay"></span> microseconds<br />'."\n";
echo '</html>';
?>
$sWord: - TestString -
$sPreg: -TestString-
$sTrim: -TestString-
preg_replace: 0.000016
preg_replace: 0.000001 (single quotes)
trim: 0.000004
difference: 0.000012
PHPStartTime: 1576080830.955585