mb_textwrap - wrapping multibyte characters

mb_textwrap.php

<?php

if ( !function_exists('mb_str_split') ) {
    function mb_str_split($string, $split_length = 1) {
        mb_internal_encoding('UTF-8');
        mb_regex_encoding('UTF-8');

        $split_length = ($split_length <= 0) ? 1 : $split_length;

        $mb_strlen = mb_strlen($string, 'utf-8');

        $array = array();

        for($i = 0; $i < $mb_strlen; $i += $split_length) {
            $array[] = mb_substr($string, $i, $split_length);
        }

        return $array;
    }
}

if( !function_exists('mb_textwrap') ) {
	function mb_textwrap($text, $length = 20, $concat = '<br>') {
		return join($concat, mb_str_split($text, $length));
	}
}

$text = "快速的棕色狐狸跳过懒狗。快速的棕色狐狸跳过懒狗。快速的棕色狐狸跳过懒狗。快速的棕色狐狸跳过懒狗。";

echo "Input: ". $text . "<br>";
echo "Output: <br>";
echo mb_textwrap($text);


/*
Input: 快速的棕色狐狸跳过懒狗。快速的棕色狐狸跳过懒狗。快速的棕色狐狸跳过懒狗。快速的棕色狐狸跳过懒狗。
Output: 
快速的棕色狐狸跳过懒狗。快速的棕色狐狸跳
过懒狗。快速的棕色狐狸跳过懒狗。快速的棕
色狐狸跳过懒狗
*/