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php 求质素(素数) 的实现代码

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Release: 2016-06-06 20:36:32
Original
1783 people have browsed it

php 求质素(素数) 的实现代码,需要的朋友可以参考下。

代码如下:
class timer
{
var $time_start;
var $time_end;

function __construct()
{
$this->time_start = 0;
$this->time_end = 0;
}

function timer()
{
$this->__construct();
}

function start()
{
list($usec,$sec) = explode(" ",microtime());
$this->time_start = (float)$usec + (float)$sec;
}

function stop()
{
list($usec,$sec) = explode(" ",microtime());
$this->time_end = (float)$usec + (float)$sec;
}

function show($output = false)
{
$total = $this->time_end - $this->time_start;
if ($output) {
echo $total," sec";
return true;
}
return $total." sec";
}

}
?>
echo 'check prime
';
function IsPrime($i)
{
if($i{
return false;
}
//var $iterator;
for($iterator = 2 ; $iterator {
if($i % $iterator==0)
{
return false;
}
}
return true;
}

$sw=new timer();
$sw->start();
for($j=1;$j{
if(IsPrime($j))
{
echo 'true
';
}
else
{
echo 'false
';
}
}
$sw->stop();
$sw->show(true);

?>

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