PHP处理日期和时间(php入门者教程)

echo "<b>格式化当前时间</b><br/>";
echo date('y-m-j');
echo "<br/>";
echo "<br/>";

echo "今天是一年中的第".date('z')."天";
echo "<br/>";
echo "<br/>";

echo date('m 网页特效,y l');
echo "<br/>";
echo "<br/>";

echo "程序执行时间：".date('h:i:s');

echo "时间戳".mktime(0,0,0,12,31,2007)."对应的日期是：";
echo "<br/>";

echo date("m-d-y", mktime(0,0,0,12,31,2007));
echo "<hr>";
echo "<br/>";

$day = 1;
echo "时间戳".mktime(0,0,0,7,$day+38,2008)."对应的日期是：<br/>";
echo date("y-m-d", mktime(0,0,0,7,$day+38,2008));
echo "<hr>";

$time = mktime(20,0,0,8,8,2008);

echo "<b>日期：".date("y-m-d h:i:s",$time)."</b>";
echo "<br/>";

echo "<pre>";
echo "该日期相关信息如下：";
echo "<br/>";

$date = getdate($time);
print_r($date);

$day = 1;
$month = 10;
$year = 1949;

$national_unix = mktime(0,0,0,$month,$day,$year);
$now_unix = time();
$national_time = $now_unix - $national_unix;

$national_day_year = floor($national_time/(365*24*60*60));
$national_day_day = floor($national_time/(24*60*60));

echo "www.111cn.net 2008已经<b> ".$national_day_year." </b>年";
echo "<hr>";

echo "2008已经<b> ".$national_day_day." </b>天"

if(checkdate(9,28,1980))
{
    echo "7,22,1978 : "."这是一个正确的日期格式";
}
else
{
    echo "这不是一个正确的日期格式";
}

echo "<br/>";
echo "<hr>";
echo "<br/>";

if(checkdate(9,99,1999))
{
    echo "这是一个正确的日期格式";
}
else
{
    echo "9,99,1999 : "."这不是一个正确的日期格式";
}

 $str_arr = array(
"mymail@111cn.net",
"my_mail@111cn.net",
"my-mail@111cn.net",
"my.mail@site.com.cn",
"mymail@site.com.ccoomm",
"mymail@site.cn",
"mymail@@@lsite.com",
"mymail@site",
"mymail@111cn.net",
"my2007@111cn.net",
"163mail_for-me777@111cn.net",
);

$patt_email = "/^[_a-za-z0-9-]+@([0-9a-z][0-9a-z-]+.)+[a-z]{2,4}$/";

foreach ($str_arr as $str)
{
    echo "字符串'$str'：是";
    if (preg_match($patt_email, $str))
    {
        echo "<b>合法的email格式</b>";
        echo "<br>";
        echo "<br>";
    }
    else
    {
        echo "不合法的email格式";
        echo "<br>";
        echo "<br>";
    }
}
 

$str_arr = array(
"http://www.111cn.net",
"www.111cn.net",
"http://www.111cn.net/abc/123.html",
"//111cn.net",
":www.111cn.net"
);

$patt_url = "/^(http://)?[a-za-z0-9]+(.[a-za-z0-9]+)*.+$/";

foreach ($str_arr as $str)
{
    echo "字符串'$str'：是";
    if (preg_match($patt_url, $str))
    {
        echo "<b>合法的url格式</b>";
        echo "<br>";
        echo "<br>";
    }
    else
    {
        echo "不合法的url格式";
        echo "<br>";
        echo "<br>";
    }
}

function getmonsun(){
    $curtime=time();
     
    $curweekday = date('w');

     //为0是 就是 星期七
    $curweekday = $curweekday?$curweekday:7;

    $curmon = $curtime - ($curweekday-1)*86400;
    $cursun = $curtime + (7 - $curweekday)*86400;
    
    $cur['mon'] = $curmon;
    $cur['sun'] = $cursun;

    return $cur;
}
    $cur = getmonsun();

    echo date('y-m-d',$cur['mon']);
    echo " ";
    echo date('y-m-d',$cur['sun']);

function myrow($id, $data)
{
    return "<tr><th>$id</th><td>$data</td></tr> ";
}

$arr = get_defined_functions();

print_r($arr);

array get_declared_classes ( void ) //返回在当前脚本中声明的类的名称的数组。

print_r(get_declared_classes());