PHP long article pagination code sharing

/**
* Long article segmentation
* @param string $article article content
* @param number $return_number article byte limit
* @return array
*/
private function ContentAddpage($content,$return_number=800){
 $return_content = ""; //Returned string
 $current_num = 0 ; //Current string length
 $return_content_num = 0; //The length after the last string interception; used to handle cases where the number of words in the final array is too long.
 $page_num_word = array(); //separated by br The array generated by using preg_split to separate strings;

 $content = strip_tags($content,',');
 $content = preg_replace("/", $content);
 $content = str_replace("","", $content);
 $content = preg_replace("//m", "", $content);
 $content_info = preg_split("//",$content);//Determine the paragraph based on the string
 $art_num = count($content_info);//Determine the number of paragraphs

 for($i=0;$i <= $art_num-1;$i++){
 $page_num_word[$i] = strlen($content_info[$i] );
 $current_num += $page_num_word[$i];//Get the number of words
 if ($current_num <= $return_number){
 $tmp_num = $return_number-$current_num;
 $return_content .= mb_substr($content_info[ $i],0,$tmp_num)."";
 $return_content_num = $current_num;
 }else{
 $tmp_num = $return_number-$return_content_num;
 $return_content .= mb_substr($content_info[$i ],0,$tmp_num)."";
 break;
 }
 }
 return $return_content;
}

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