计算两个日期间相差多少天，代码：

<?php 
/**
 * 求两个日期之间相差的天数(针对1970年1月1日之后，求之前可以采用泰勒公式)
 * @param string $day1
 * @param string $day2
 * @return number
 */
function diffBetweenTwoDays ($day1, $day2)
{
    $second1 = strtotime($day1);
    $second2 = strtotime($day2);
     
    if ($second1 < $second2) {
        $tmp = $second2;
        $second2 = $second1;
        $second1 = $tmp;
    }
     
    return ($second1 - $second2) / 86400;
}
 
$day1 = "2013-07-27";
$day2 = "2013-08-04";
 
$diff = diffBetweenTwoDays($day1, $day2);
echo $diff."\n";
?>

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本节分享的这段php代码，可以根据域名，采用fsockopen的方法来检测服务器的当前状态。

代码：

<?
/**
* 检测服务器状态
*/
# Domain Name
$domainName = "http://www." ;

#My Function
function DomainCheck($domainName){
    $startTime = microtime(true);
    $openDomain = fsockopen ($domainName, 80, $errno, $errstr, 10);
    $finishTime  = microtime(true);
    $serverStatus    = 0;

    if (!$openDomain) $serverStatus = -1;  
    else {
        fclose($openDomain);
        $status = ($finishTime - $startTime) * 1000;
        $serverStatus = floor($serverStatus);
    }
    return $serverStatus;
}

$serverStatus = DomainCheck($domainName);

# Results...
if ($serverStatus != -1) {
echo "Server is seemed off" ;
} else {
echo "Server is running well" ;
} 
?>

php随机图片显示代码，如下：

<?php
/**
* 随机显示几张图片
* by www.
*/
$resim1="<img src=/blog_article/1.gif alt=Resim_1>";
$resim2="<img src=/blog_article/2.gif alt=Resim_2>";
$resim3="<img src=/blog_article/3.gif alt=Resim_3>";
$resim4="<img src=/blog_article/4.gif alt=Resim_4>";

$resim=array($resim1,$resim2,$resim3,$resim4);

shuffle ($resim);

echo "<table width=\"445\" height=\"245\" border=\"1\" bordercolor=\"black\">
  <tr>
    <td>"; echo $resim[0]; "</td>
    <td>"; echo $resim[1];"</td>
  </tr>
  <tr>
    <td>"; echo $resim[2];"</td>
    <td>"; echo $resim[3];"</td>
  </tr>
</table>

";
?>