php实例

<?php
global $i,$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 code
for ($x=0; $x<10000; $x++) {
    for($i=0;$i<10000;$i++){
$null = $x * $x;
}
}

// get ending value
$end = microtime();

// calculate time taken for code execution
echo "Elapsed time: " . ($end - $start) ." sec";
?>