3v4l.org

run code in 300+ PHP versions simultaneously
<?php function msubstr($str, $start=0, $length, $charset="utf-8", $suffix=true) { if($suffix){ $suffixStr = "…"; }else { $suffixStr = ""; } if(function_exists("mb_substr")) return mb_substr($str, $start, $length, $charset).$suffixStr; elseif(function_exists('iconv_substr')) { return iconv_substr($str,$start,$length,$charset).$suffixStr; } $re['utf-8'] = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|[\xe0-\xef][\x80-\xbf]{2}|[\xf0-\xff][\x80-\xbf]{3}/"; $re['gb2312'] = "/[\x01-\x7f]|[\xb0-\xf7][\xa0-\xfe]/"; $re['gbk'] = "/[\x01-\x7f]|[\x81-\xfe][\x40-\xfe]/"; $re['big5'] = "/[\x01-\x7f]|[\x81-\xfe]([\x40-\x7e]|\xa1-\xfe])/"; preg_match_all($re[$charset], $str, $match); $slice = join("",array_slice($match[0], $start, $length)); return $slice.$suffixStr; } $a = '测试这是一个测试'; //$a = 'xxxxbbbbbnnn'; $b = msubstr($a,0,5); var_dump($b); ?>

preferences:
37.38 ms | 402 KiB | 5 Q