The original intention of the design is: article list page. If you use strip_tags to delete all styles, the article introduction on the homepage will look messy and have no style. If you simply use strip_tags to retain p or br, then p or br will be truncated when you intercept the string.
The design idea is: keep p and br, then replace p with br; then use br as the separator to separate the entire article.
The specific code is as follows: you can use it directly
/**
* 长文章分段
* @param string $article 文章内容
* @param number $return_number 文章字节限制
* @return array
*/
private function ContentAddpage($content,$return_number=800){
$return_content = ""; //返回的字符串
$current_num = 0; //当前字符串长度
$return_content_num = 0; //上次字符串截取后的长度；用来处理最后数组中字数过长的case.
$page_num_word = array();//以br为分隔符使用preg_split分隔字符串生成的数组；
$content = strip_tags($content,'<p>,<br>');
$content = preg_replace("/<p(.*?)>/m", "<br>", $content);
$content = str_replace("</p>","", $content);
$content = preg_replace("/<br(.*?)>/m", "<br>", $content);
$content_info = preg_split("/\<br\>/",$content);//根据字符串确定段落
$art_num = count($content_info);//确定段落数
for($i=0;$i <= $art_num-1;$i++){
$page_num_word[$i] = strlen($content_info[$i]);
$current_num += $page_num_word[$i];//得到字数
if ($current_num <= $return_number){
$tmp_num = $return_number-$current_num;
$return_content .= mb_substr($content_info[$i],0,$tmp_num)."<br>";
$return_content_num = $current_num;
}else{
$tmp_num = $return_number-$return_content_num;
$return_content .= mb_substr($content_info[$i],0,$tmp_num)."<br>";
break;
}
}
return $return_content;
}
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