php mb_chunk_split函数支持宽字符分割

<?php 
/**
 * 分割字符串 
 * @param String $str  要分割的字符串 
 * @param int $length  指定的长度 
 * @param String $end  在分割后的字符串块追加的内容 
 */ 
function mb_chunk_split($string, $length, $end, $once = false){ 
    $string = iconv('gb2312', 'utf-8//ignore', $string); 
    $array = array(); 
    $strlen = mb_strlen($string); 
    while($strlen){ 
        $array[] = mb_substr($string, 0, $length, "utf-8"); 
        if($once) 
            return $array[0] . $end; 
        $string = mb_substr($string, $length, $strlen, "utf-8"); 
        $strlen = mb_strlen($string); 
    } 
    return implode($end, $array); 
}   
 
$str = 's六一马上$就dfs要到$@#了'; 
$str1 = 'aabbccddeefff'; 
echo mb_chunk_split($str, 3, '...', true); //s六一...马上$...就df...s要到...$@#...了   
echo "<br>"; 
echo mb_chunk_split($str1, 2, '...'); //aa...bb...cc...dd...ee...ff...f