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run_time.php  Code:
<?php
class runtime
{
var $StartTime = 0;
var $StopTime = 0;
function get_microtime()
{
list($usec, $sec) = explode(' ', microtime());
return ((float)$usec + (float)$sec);
}
function start()
{
$this->StartTime = $this->get_microtime();
}
function stop()
{
$this->StopTime = $this->get_microtime();
}
function spent()
{
return round(($this->StopTime - $this->StartTime) * 1000, 1);
}
}
?>
return_time_test.php  Code:
<?php
include ('run_time.php');
$runtime = new runtime;
$runtime->start();
$a = 0;
for ($i=0;$i&ltrim(1000000);$i++){
$a += $i;
}
$runtime->stop();
echo "Ò³ÃæÖ´ÐÐʱ¼ä£º".$runtime->spent()."ºÁÃë!";
?>


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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Sample 2_1</title>
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Code:
<?php
function genRandomString($len)
{
$chars = array(
"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", 
"l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", 
"w", "x", "y", "z", "A", "B", "C", "D", "E", "F", "G", 
"H", "I", "J", "K", "L", "M", "N", "O", ......
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