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ThinkPHP字符截取函数,兼容utf-8与gb2312.

function msubstr($str, $start=0, $length, $charset="utf-8", $suffix=true) { if(function_exists("mb_substr")){ $slice = mb_substr($str, $start, $length, $charset); $strlen = mb_strlen($str,$charset); }elseif(function_exists('iconv_substr')) { $slice = iconv_substr($str,$start,$length,$charset); $strlen = iconv_strlen($str,$charset); if(false === $slice) { $slice = ''; } }else{ $re['utf-8']   = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|[\xe0-\xef][\x80-\xbf]{2}|[\xf0-\xff...