= 3) {$end = func_get_arg(2);return mb_substr($str,$start,$end,'utf-8');}else {mb_internal_encoding(utf-8);return mb_substr($str,$start);}}else {$null = ;preg_match_all(/./u, $str, $ar);if(func_num_args() >= 3) {$end = func_get_arg(2);return join($null, array_slice($ar[0],$start,$end));}else {return join($null, array_slice($ar[0],$start));}}}$str2 = 'wo要截取zhongwen';echo '
';echo utf8_substr($str2,0,-4); //return wo要截取zhon?>
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2、支持gb2312,gbk,utf-8,big5 中文截取方法
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