我正在使用以下代码在我的内容中放置一些广告代码。

<?php
$content = apply_filters('the_content', $post->post_content);
$content = explode (' ', $content);
$halfway_mark = ceil(count($content) / 2);
$first_half_content = implode(' ', array_slice($content, 0, $halfway_mark));
$second_half_content = implode(' ', array_slice($content, $halfway_mark));
echo $first_half_content.'...';
echo ' YOUR ADS CODE';
echo $second_half_content;
?>

我该如何修改它，以便我可以在纯文本段落之间同时放置 2 个广告(两个包含广告的 <p>...</p> 不应包含图像或嵌入式视频)。

我想避免使用 jQuery。

我的用例示例...

• 我想在这篇文章中插入 2 个广告 block 。
• 我希望第一个广告 block 位于第 1 段之后。但第 1 段中的任何图像都应删除。
• 对于第二个广告，它应该尽可能放在文章的后半部分纯文本段落之间，这样广告代码就可以夹在大量文本之间，并且永远不会非常靠近嵌入的图像或视频等。
• 2 个广告之间应至少有 2 个段落

最佳答案

这是我对这个问题的看法。抱歉发帖有点晚了(并且错过了赏金 :-( )，但这是忙碌的一周，所以我把所有的事情都零零碎碎地做了。

快速结束

• 我没有删除第一段中的附件。我真的不明白为什么必须为了广告而破坏内容

• 我在我的代码中做了很多检查，以尝试确保广告仅插入纯文本段落之间。纯文本段落被认为是不包含 img、li 和 ul 标签的段落

• 我已正确记录每个代码块，因此您可以轻松完成每个部分。我还添加了 todo如有必要，您需要注意的文档 block

• 我用过wptexturize将 p 标签应用于 the_content .每个双换行符构成一个段落

• 根据需要修改和使用此代码。我已经测试过了，所以我这边没有错误。

这是代码。希望这对您有用。 *附言!所有这些都进入您的 functions.php。您的模板文件不需要任何其他代码或模组

<?php
add_filter( 'the_content', 'so_25888630_ad_between_paragraphs' );

function so_25888630_ad_between_paragraphs($content){
    /**-----------------------------------------------------------------------------
     *
     *  @author       Pieter Goosen <http://stackoverflow.com/users/1908141/pieter-goosen>
     *  @return       Ads in between $content
     *  @link         http://stackoverflow.com/q/25888630/1908141
     * 
     *  Special thanks to the following answers on my questions that helped me to
     *  to achieve this
     *     - http://stackoverflow.com/a/26032282/1908141
     *     - http://stackoverflow.com/a/25988355/1908141
     *     - http://stackoverflow.com/a/26010955/1908141
     *     - http://wordpress.stackexchange.com/a/162787/31545
     *
    *------------------------------------------------------------------------------*/ 
    if( in_the_loop() ){ //Simply make sure that these changes effect the main query only

        /**-----------------------------------------------------------------------------
         *
         *  wptexturize is applied to the $content. This inserts p tags that will help to  
         *  split the text into paragraphs. The text is split into paragraphs after each
         *  closing p tag. Remember, each double break constitutes a paragraph.
         *  
         *  @todo If you really need to delete the attachments in paragraph one, you want
         *        to do it here before you start your foreach loop
         *
        *------------------------------------------------------------------------------*/ 
        $closing_p = '</p>';
        $paragraphs = explode( $closing_p, wptexturize($content) );

        /**-----------------------------------------------------------------------------
         *
         *  The amount of paragraphs is counted to determine add frequency. If there are
         *  less than four paragraphs, only one ad will be placed. If the paragraph count
         *  is more than 4, the text is split into two sections, $first and $second according
         *  to the midpoint of the text. $totals will either contain the full text (if 
         *  paragraph count is less than 4) or an array of the two separate sections of
         *  text
         *
         *  @todo Set paragraph count to suite your needs
         *
        *------------------------------------------------------------------------------*/ 
        $count = count( $paragraphs );
        if( 4 >= $count ) {
            $totals = array( $paragraphs ); 
        }else{
            $midpoint = floor($count / 2);
            $first = array_slice($paragraphs, 0, $midpoint );
            if( $count%2 == 1 ) {
                $second = array_slice( $paragraphs, $midpoint, $midpoint, true );
            }else{
                $second = array_slice( $paragraphs, $midpoint, $midpoint-1, true );
            }
            $totals = array( $first, $second );
        }

        $new_paras = array();   
        foreach ( $totals as $key_total=>$total ) {
            /**-----------------------------------------------------------------------------
             *
             *  This is where all the important stuff happens
             *  The first thing that is done is a work count on every paragraph
             *  Each paragraph is is also checked if the following tags, a, li and ul exists
             *  If any of the above tags are found or the text count is less than 10, 0 is 
             *  returned for this paragraph. ($p will hold these values for later checking)
             *  If none of the above conditions are true, 1 will be returned. 1 will represent
             *  paragraphs that qualify for add insertion, and these will determine where an ad 
             *  will go
             *  returned for this paragraph. ($p will hold these values for later checking)
             *
             *  @todo You can delete or add rules here to your liking
             *
            *------------------------------------------------------------------------------*/ 
            $p = array();
            foreach ( $total as $key_paras=>$paragraph ) {
                $word_count = count(explode(' ', $paragraph));
                if( preg_match( '~<(?:img|ul|li)[ >]~', $paragraph ) || $word_count < 10 ) {  
                    $p[$key_paras] = 0; 
                }else{
                    $p[$key_paras] = 1; 
                }   
            }

            /**-----------------------------------------------------------------------------
             *
             *  Return a position where an add will be inserted
             *  This code checks if there are two adjacent 1's, and then return the second key
             *  The ad will be inserted between these keys
             *  If there are no two adjacent 1's, "no_ad" is returned into array $m
             *  This means that no ad will be inserted in that section
             *
            *------------------------------------------------------------------------------*/ 
            $m = array();
            foreach ( $p as $key=>$value ) {
                if( 1 === $value && array_key_exists( $key-1, $p ) && $p[$key] === $p[$key-1] && !$m){
                    $m[] = $key;
                }elseif( !array_key_exists( $key+1, $p ) && !$m ) {
                    $m[] = 'no-ad';
                }
            } 

            /**-----------------------------------------------------------------------------
             *
             *  Use two different ads, one for each section
             *  Only ad1 is displayed if there is less than 4 paragraphs
             *
             *  @todo Replace "PLACE YOUR ADD NO 1 HERE" with your add or code. Leave p tags
             *  @todo I will try to insert widgets here to make it dynamic
             *
            *------------------------------------------------------------------------------*/ 
            if( $key_total == 0 ){
                $ad = array( 'ad1' => '<p>PLACE YOUR ADD NO 1 HERE</p>' );
            }else{
                $ad = array( 'ad2' => '<p>PLACE YOUR ADD NO 2 HERE</p>' );
            }

            /**-----------------------------------------------------------------------------
             *
             *  This code loops through all the paragraphs and checks each key against $mail
             *  and $key_para
             *  Each paragraph is returned to an array called $new_paras. $new_paras will
             *  hold the new content that will be passed to $content.
             *  If a key matches the value of $m (which holds the array key of the position
             *  where an ad should be inserted) an add is inserted. If $m holds a value of
             *  'no_ad', no ad will be inserted
             *
            *------------------------------------------------------------------------------*/ 
            foreach ( $total as $key_para=>$para ) {
                if( !in_array( 'no_ad', $m ) && $key_para === $m[0] ){
                    $new_paras[key($ad)] = $ad[key($ad)];
                    $new_paras[$key_para] = $para;
                }else{
                    $new_paras[$key_para] = $para;
                }
            }
        }

        /**-----------------------------------------------------------------------------
         *
         *  $content should be a string, not an array. $new_paras is an array, which will
         *  not work. $new_paras are converted to a string with implode, and then passed
         *  to $content which will be our new content
         *
        *------------------------------------------------------------------------------*/ 
        $content =  implode( ' ', $new_paras );
    }
    return $content;
}

编辑

来自您的评论:

• 你应该使用下面的代码来调试<pre><?php var_dump($NAME_OF_VARIABLE); ?></pre> .对于您的第一期，我将使用 ?><pre><?php var_dump($paragraphs); ?></pre><?php就在这一行之后 $paragraphs = explode( $closing_p, wpautop($content) );以准确查看内容是如何拆分的。这会让您了解您的内容是否被正确分割。

• 同时使用 ?><pre><?php var_dump($p); ?></pre><?php就在这一行之后 $p = array();检查赋予特定段落的值。请记住，带有 img、li 和 ul 标签的段落应该有一个 0。 ，还有少于 10 个单词的段落。其余的应该有一个 1

• 编辑 -> 删除段落的问题已解决。感谢您向我指出该缺陷。从来没有意识到这一点。我已经更新了代码，所以只需复制并粘贴即可

编辑 2

请注意，您无法使用您正在使用的在线工具测试您的代码。这不是 the_content() 输出内容的真实反射(reflect)。 .您使用在线工具看到的输出在发送到屏幕之前会被过滤和标记为 the_content() .如果您使用 google chrome 等浏览器检查输出，您会看到 p 标签已正确应用。

我还更改了代码中带有图像标签的a标签

关于php - 在纯文本段落之间放置广告，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/25888630/