php 中文字串截取函數

<?
//php教程 中文字串截取函數
/*

*/

代碼如下	複製代碼
function substr($str = '', $offset = 0, $len = 0){     $len || ($len = strlen($str));     preg_match_all('/./us', $str, $result);     return implode('', array_slice($result[0], $offset, $len)); }

//方法二

代碼如下

複製代碼

if (!function_exists('mb_substr')) { function mb_substr($str, $start, $len = '', $encoding="utf-8"){   $limit = strlen($str);   for ($s = 0; $start > 0;--$start) {// found the real start     if ($s >= $limit)       break;     if ($str[$s] <= "")       ++$s;     else {       ++$s; // skip length       while ($str[$s] >= "€" && $str[$s] <= "�")         ++$s;     }   }   if ($len == '')     return substr($str, $s);   else     for ($e = $s; $len > 0; --$len) {//found the real end       if ($e >= $limit)         break;       if ($str[$e] <= "")         ++$e;       else {         ++$e;//skip length         while ($str[$e] >= "€" && $str[$e] <= "�" && $e < $limit)           ++$e;       }     }   return substr($str, $s, $e - $s); } }

?>