PHP技巧：分析利用PHP制作新闻系统的步骤

function connect_db()
{
// connects to the database
global $database_user_name, $database_password;
$db=mysql_connect("localhost",$database_user_name,$database_password);
return $db;
}
function db_name()
{
// returns the name of the database
global $database_name;
$db_name=$database_name;
return $db_name;
}
function get_now()
{
// gets current date and time
$db=connect_db();
$db_name=db_name();
mysql_select_db($db_name,$db);
$sql="select now() as now";
$result=mysql_query($sql,$db);
$myrow=mysql_fetch_array($result);
$now=$myrow["now"];
return $now;
}

//上面已经定义的函数库...
//表格的定义......
<center><FONT SIZE=5 FACE="'georgia',verdana,Arial,Lucida Sans,Gill Sans">$title ";
if ($admin==1)
{
echo " Admin ";
}
echo " - News</font> </td></tr> ";
$db=connect_db();
$db_name=db_name();
mysql_select_db($db_name,$db);
if ($show_news_sub)
{
$show_news=$show_news_sub;
}
if (!ereg("([0-9]{".strlen($show_news)."})",$show_news))
{
$show_news="ALL";
}
if (strtoupper($show_news)=="ALL")
{
$sql="select date_format(n_date,'%m/%d/%Y') as n_date, date_format(n_date,'%H:%i') as n_time ,news , n_date as date from news order by date desc";
}
else
{
$link="<a href=http://www.chinaz.com/program/2007/0903/$REQUEST_URL?show_news_sub=ALL><FONT SIZE=-2 FACE="'georgia',verdana,Arial,Lucida Sans,Gill Sans">All news</font></a>";
$sql="select date_format(n_date,'%m/%d/%Y') as n_date, date_format(n_date,'%H:%i') as n_time , news , n_date as date from news order by n_date desc limit $show_news";
}
$result=mysql_query($sql,$db);
$num_rows=mysql_num_rows($result);
if($num_rows!=0)
{
echo " ";
while($myrow=mysql_fetch_array($result))
{
$date=$myrow["n_date"];
$time=$myrow["n_time"];
$news=$myrow["news"];
$n_id=$myrow["n_id"];
if (strtoupper($show_date)=="Y" && strtoupper($show_time)=="Y")
{
$show=$date." ".$time;
}
else if (strtoupper($show_date)=="Y" && strtoupper($show_time)!="Y")
{
$show=$date;
}
if (strtoupper($show_date)!="Y" && strtoupper($show_time)=="Y")
{
$show=$time;
}
$cleannews=(nl2br($news));
<TD align=left><FONT SIZE=-2 FACE="'verdana',Arial,Lucida Sans,Gill Sans">$show<br>$cleannews</font</TD>
";
}
echo " ";
}
if ($admin==1)
{
echo "<center><a href=http://www.chinaz.com/program/2007/0903/admin/index.php><FONT SIZE=-2 FACE="'verdana',Arial,Lucida Sans,Gill Sans">返回</font></a></center>";
}
if ($link)
{
echo "<center><br><br>$link</center>";
}