<?phpglobal $i,$sum;for($i=0;$i<=100;$i++){    $sum=$sum+$i;}    echo "1加到100为".$sum."数";?>

<?php// get starting value$start = microtime();// run some codefor ($x=0; $x<10000; $x++) {    for($i=0;$i<10000;$i++){$null = $x * $x;}}// get ending value$end = microtime();// calculate time taken for code executionecho "Elapsed time: " . ($end - $start) ." sec";?>