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:
preg_replace(”/([x80-xff])/”,”",$str);
preg_replace(”/([u4e00-u9fa5])/”,”",$str);
二、代码例子
代码如下:
//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 UTF-8 compatible string'); } $count++; } return(substr($str,$start_position,$end_position-$start_position)); } //判断是否是有韩文-UTF-8 (JavaScript) function checkKoreaChar(str) { for(i=0; i<str.length; i++) { if(((str.charCodeAt(i) > 0x3130 && str.charCodeAt(i) < 0x318F) || (str.charCodeAt(i) >= 0xAC00 && str.charCodeAt(i) <= 0xD7A3))) { return true; } } return false; } //判断是否有中文字符-GBK (JavaScript) function check_chinese_char(s){ return (s.length != s.replace(/[^x00-xff]/g,"**").length); }
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