html_wrap.php

<?php
/**
 * Split string and wrap text with preserving html
 * 
 */
function html_wrap( string $string, bool $output_array = true, int $width = 30, string $break = " \r\n" , bool $cut_long_words = false ) {
    
    if ( empty( $string ) ) {
        return false;
    }
    
    $output = array();
    $delimeter = PHP_EOL;
    
    // Make a safety for start tag with |
    $string = preg_replace( '/(<(?!\/).*?>)/', '|$1', $string );
    
    // Make a safety for closing tag with |
    $string = preg_replace( '/(<\/.*?>)/', '$1|', $string );
    
    // Split the string
    $str_list = array_filter( explode( '|', $string ) );
    
    foreach( $str_list as $str ) {
        if ( strpos( $str, '</' ) !== false ) {
            $output[][] = $str;
            continue;
        }
        
        $tmp_str = wordwrap( $str, $width, $break, $cut_long_words );
        $output[] = preg_split( "/($delimeter)/", $tmp_str );
    }
    
    if ( !$output_array ) {
        $output = iterator_to_array( new \RecursiveIteratorIterator(new \RecursiveArrayIterator($output) ), false );
        $output = join( "", $output );
    }
    
    return $output;
    
}

print_r( html_wrap( 'Seeing Meng You remain silent,  Yan Ke coughed <strong>twice</strong>, and used his <strong>slightly hoarse</strong> voice to provoke the prince. Yan Ke: "Look, I’ve made such a huge offense, your Yue Kingdom definitely won’t keep me alive, right? You must be a benevolent king~"' ) );