quot;<guid>" . $guid . "</guid>";
$feed .= "</item>";
}
$feed .= "</rss";
// write the feed out to the server...
echo($feed);
}
?>
如果多编写几个这样的方法,维护就成了真正的难题了。
良好习惯:易管理、功能专一的方法
清单 4 将原来的方法改写为更加紧凑、易读的方法。在这个示例中,将一个很长的方法分解为几个短方法,并且让每个短方法负责一件事情。这样的代码对将来的重用和测试都是大有裨益的。
清单 4. 良好习惯:易管理、功能专一的方法
<?php
function createRssHeader()
{
return "<rss version="2.0">" .
"<channel>" .
"<title>My Great Feed</title>" .
"<link>http://www.example.com/feed.xml</link>" .
"<description>The best feed in the world</description>" .
"<language>en-us</language>" .
"<pubDate>Tue, 20 Oct 2008 10:00:00 GMT</pubDate>" .
"<lastBuildDate>Tue, 20 Oct 2008 10:00:00 GMT</lastBuildDate>" .
"<docs>http://www.example.com/rss</docs>" .
"<generator>MyFeed Generator</generator>" .
"<managingEditor>editor@example.com</managingEditor>" .
"<webMaster>webmaster@example.com</webMaster>" .
"<ttl>5</ttl>";
}
function createRssFooter()
{
return "</channel></rss>";
}
function createRssItem($title, $link, $desc, $date, $guid)
{
$item .= "<item>";
$item .= "<title>" . $title . "</title>";
$item .= "<link>" . $link . "</link>";
$item .= "<description> " . $description . "</description>";
$item .= "<pubDate>" . $date . "</pubDate>";
$item .= "<guid>" . $guid . "</guid>";
$item .= "</item>";
return $item;
}
function getUserMaxStories($db_link, $default)
{
$perfsQuery = sprintf("SELECT max_stories FROM user_perfs WHERE user= ''%s''",
mysql_real_escape_string($user));
$result = mysql_query($perfsQuery, $db_link);
$max_stories = $default;
if ($row = mysql_fetch_assoc($result)) {
$max_stories = $row[''max_stories''];
}
return $max_stories;
}
function writeRssFeed($user)
{
// Get the DB connection information
$settings = parse_ini_file("rss_server.ini");
// look up the user''s preferences...
$link = mysql_connect($settings[''db_host''], $settings[''user''],
$settings[''password'']) OR die(mysql_error());
$max_stories = getUserMaxStories($link, 25);
// go get my data
$newsQuery = sprintf("SELECT * FROM stories WHERE post_date = ''%s''",
mysql_real_escape_string(time()));
$result = mysql_query($newsQuery, $link);
$feed = createRssHeader();
$i = 0;
// build the feed...
whi
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