众里寻他千百度，蓦然回首，那人却在灯火阑珊处。
上星期已经把“当年今日”功能加到blog里（详细见Arm 2 W），从一开始就打算要加入rss的，但费尽九牛二虎之力都没做到，但今天，终于攻克了！
到底什么原因呢？
首先，我们要看我当年今日的源代码，利用
完成插入，在function.php的代码如下：
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| function wp_today(){
$title = "<h3>当年今日</h3>";
$limit = 10;
$order = "latest";
$post = 1;
$feed = 1;
global $wpdb;
$post_year = get_the_time('Y');
$post_month = get_the_time('m');
$post_day = get_the_time('j');
if($order == "latest"){ $order = "DESC";} else { $order = '';}
$sql = "select ID, date(post_date_gmt) as h_date, post_title, comment_count FROM
$wpdb->posts WHERE post_password = '' AND post_type = 'post' AND post_status = 'publish'
AND year(post_date_gmt)!='$post_year' AND month(post_date_gmt)='$post_month' AND day(post_date_gmt)='$post_day'
order by post_date_gmt $order limit $limit";
$histtory_post = $wpdb->get_results($sql);
if( $histtory_post ){
foreach( $histtory_post as $post ){
$h_date = $post->h_date;
$h_post_title = $post->post_title;
$h_permalink = get_permalink( $post->ID );
$h_comments = $post->comment_count;
$h_post .= "<li>$h_date -- <a href='".$h_permalink."' title='Permanent Link to ".$h_post_title."'>$h_post_title</a> <!--($h_comments) --></li>";
}
}
if ( $h_post ){
$result = "".$title."<ul>".$h_post."</ul>";
}
echo $result;
} |
function wp_today(){
$title = "<h3>当年今日</h3>";
$limit = 10;
$order = "latest";
$post = 1;
$feed = 1;
global $wpdb;
$post_year = get_the_time('Y');
$post_month = get_the_time('m');
$post_day = get_the_time('j');
if($order == "latest"){ $order = "DESC";} else { $order = '';}
$sql = "select ID, date(post_date_gmt) as h_date, post_title, comment_count FROM
$wpdb->posts WHERE post_password = '' AND post_type = 'post' AND post_status = 'publish'
AND year(post_date_gmt)!='$post_year' AND month(post_date_gmt)='$post_month' AND day(post_date_gmt)='$post_day'
order by post_date_gmt $order limit $limit";
$histtory_post = $wpdb->get_results($sql);
if( $histtory_post ){
foreach( $histtory_post as $post ){
$h_date = $post->h_date;
$h_post_title = $post->post_title;
$h_permalink = get_permalink( $post->ID );
$h_comments = $post->comment_count;
$h_post .= "<li>$h_date -- <a href='".$h_permalink."' title='Permanent Link to ".$h_post_title."'>$h_post_title</a> <!--($h_comments) --></li>";
}
}
if ( $h_post ){
$result = "".$title."<ul>".$h_post."</ul>";
}
echo $result;
}
这堆代码，要实现在blog的某个位置输出当年今日没有任何问题，但要注意，数据是用“echo $result;”完结的，这就埋下了伏笔。
我试过很多回，试图在function.php加入以下这堆代码调用上面的代码实现当年今日在rss中的输出：
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| function wp_today_rss($content){
if (is_feed()){
$content = $content.wp_today();
return $content;
}
else {
return $content;
}
}
add_filter('the_content', 'wp_today_rss'); |
function wp_today_rss($content){
if (is_feed()){
$content = $content.wp_today();
return $content;
}
else {
return $content;
}
}
add_filter('the_content', 'wp_today_rss');
输出是能输出了，但结果很囧，见图：
当年今日输出在了正文前面！（那堆乱码东西是正文），但代码中我明明是这般写的“$content = $content.wp_today();”，东西应该加在后面的，但实际上却在前面，这让我百思不得其解。
无可奈何，今天试过用最笨的方法把wp_today()除echo $result;以外的数据全部往function wp_today_rss里放，能实现了我希望的效果，见图：
到底怎么办呢？难道要很笨地把同1段代码写2回？？？？？
狂抓不已，于是就去请教别人了，但一请教，人家还没回答我就有了头绪，不如把上面两段代码拆分为3段，即：
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| function get_today(){
$title = "<h3>当年今日</h3>";
$limit = 10;
$order = "latest";
$post = 1;
$feed = 1;
global $wpdb;
$post_year = get_the_time('Y');
$post_month = get_the_time('m');
$post_day = get_the_time('j');
if($order == "latest"){ $order = "DESC";} else { $order = '';}
$sql = "select ID, date(post_date_gmt) as h_date, post_title, comment_count FROM
$wpdb->posts WHERE post_password = '' AND post_type = 'post' AND post_status = 'publish'
AND year(post_date_gmt)!='$post_year' AND month(post_date_gmt)='$post_month' AND day(post_date_gmt)='$post_day'
order by post_date_gmt $order limit $limit";
$histtory_post = $wpdb->get_results($sql);
if( $histtory_post ){
foreach( $histtory_post as $post ){
$h_date = $post->h_date;
$h_post_title = $post->post_title;
$h_permalink = get_permalink( $post->ID );
$h_comments = $post->comment_count;
$h_post .= "<li>$h_date -- <a href='".$h_permalink."' title='Permanent Link to ".$h_post_title."'>$h_post_title</a> <!--($h_comments) --></li>";
}
}
if ( $h_post ){
$result = "".$title."<ul>".$h_post."</ul>";
}
return $result;
}
function wp_today(){
echo get_today();
}
function wp_today_rss($content){
if (is_feed()){
$content = $content.get_today();
return $content;
}
else {
return $content;
}
}
add_filter('the_content', 'wp_today_rss'); |
function get_today(){
$title = "<h3>当年今日</h3>";
$limit = 10;
$order = "latest";
$post = 1;
$feed = 1;
global $wpdb;
$post_year = get_the_time('Y');
$post_month = get_the_time('m');
$post_day = get_the_time('j');
if($order == "latest"){ $order = "DESC";} else { $order = '';}
$sql = "select ID, date(post_date_gmt) as h_date, post_title, comment_count FROM
$wpdb->posts WHERE post_password = '' AND post_type = 'post' AND post_status = 'publish'
AND year(post_date_gmt)!='$post_year' AND month(post_date_gmt)='$post_month' AND day(post_date_gmt)='$post_day'
order by post_date_gmt $order limit $limit";
$histtory_post = $wpdb->get_results($sql);
if( $histtory_post ){
foreach( $histtory_post as $post ){
$h_date = $post->h_date;
$h_post_title = $post->post_title;
$h_permalink = get_permalink( $post->ID );
$h_comments = $post->comment_count;
$h_post .= "<li>$h_date -- <a href='".$h_permalink."' title='Permanent Link to ".$h_post_title."'>$h_post_title</a> <!--($h_comments) --></li>";
}
}
if ( $h_post ){
$result = "".$title."<ul>".$h_post."</ul>";
}
return $result;
}
function wp_today(){
echo get_today();
}
function wp_today_rss($content){
if (is_feed()){
$content = $content.get_today();
return $content;
}
else {
return $content;
}
}
add_filter('the_content', 'wp_today_rss');
嘿嘿，对味！function get_today()是核心代码，function wp_today()用作来打印输出，function wp_today_rss()使之能加入到rss中。哈，“echo $result;”换成了“return $result;”解决了纠结我很久的千古难题。只能叹一句，从前的函数调用没领会透，也没有认真留意数据返回那些事。
最后，终于把问题解决了，爽得飞天，哈哈哈～～～～
PS：感谢SH童鞋的鼎力支持！
PS2：代码可能在rss中不能全部显示，有需要者请移步网页。
