一、编码范围 1. GBK (GB2312/GB18030) \x00-\xff GBK双字节编码范围 \x20-\x7f ASCII \xa1-\xff 中文 \x80-\xff 中文
2. UTF-8 (Unicode) \u4e00-\u9fa5 (中文) \x3130-\x318F (韩文 \xAC00-\xD7A3 (韩文) \u0800-\u4e00 (日文) ps: 韩文是大于[\u9fa5]的字符
正则例子:
PLAIN TEXT PHP: preg_replace("/([\x80-\xff])/","",$str); preg_replace("/([u4e00-u9fa5])/","",$str);
二、代码例子
PLAIN TEXT PHP: //判断内容里有没有中文-GBK (PHP) function check_is_chinese($s){ return preg_match(''/[\x80-\xff]./'', $s); } //获取字符串长度-GBK (PHP) function gb_strlen($str){ $count = 0; for($i=0; $i<strlen($str); $i++){ $s = substr($str, $i, 1); if (preg_match("/[\x80-\xff]/", $s)) ++$i; ++$count; } return $count; } //截取字符串字串-GBK (PHP) function gb_substr($str, $len){ $count = 0; for($i=0; $i<strlen($str); $i++){ if($count == $len) break; if(preg_match("/[\x80-\xff]/", substr($str, $i, 1))) ++$i; ++$count; } return substr($str, 0, $i); } //统计字符串长度-UTF8 (PHP) function utf8_strlen($str) { $count = 0; for($i = 0; $i <strlen($str); $i++){ $value = ord($str[$i]); if($value> 127) { $count++; if($value>= 192 && $value <= 223) $i++; elseif($value>= 224 && $value <= 239) $i = $i + 2; elseif($value>= 240 && $value <= 247) $i = $i + 3; else die(''Not a UTF-8 compatible string''); } $count++; } return $count; } //截取字符串-UTF8(PHP) function utf8_substr($str,$position,$length){ $start_position = strlen($str); $start_byte = 0; $end_position = strlen($str); $count = 0; for($i = 0; $i <strlen($str); $i++){ if($count>= $position && $start_position> $i){ $start_position = $i; $start_byte = $count; } if(($count-$start_byte)>=$length) { $end_position = $i; break; } $value = ord($str[$i]); if($value> 127){ $count++; if($value>= 192 && $value <= 223) $i++; elseif($value>= 224 && $value <= 239) $i = $i + 2; elseif($value>= 240 && $value <= 247) $i = $i + 3; else die(''Not a U |