PHP截取中英文字符串,支持中英混合

标准
/* PHP截取中英文字符串,不按字符数而是按宽度来截取 * 仅针对UTF-8字符 */ function msubstr($str, $start = 0, $length, $charset = "utf-8", $suffix = true) { if (function_exists ( "mb_substr" )) $slice = mb_substr ( $str, $start, $length, $charset ); elseif (function_exists ( 'iconv_substr' )) { $slice = iconv_substr ( $str, $start, $length, $charset ); if (false === $slice) { $slice = ''; } } else { $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 $suffix ? $slice . '...' : $slice; }

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