php把字符串分割为一连串更小的部分函数chunk_split()

<?php
$str = "Hello world!";
echo chunk_split($str,1,".");
?>

chunk_split(string,length,end)

<?php
$str = "Hello world!";
echo chunk_split($str,6,"...");
?>

<?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