1.字符串长度
PHP获取中英文混合字符串长度的实现代码如下,1中文=1位,2英文=1位,可自行修改
- /**
- * PHP获取字符串中英文混合长度
- * @param $str string 字符串
- * @param $$charset string 编码
- * @return 返回长度,1中文=1位,2英文=1位
- */
- function strLength($str,$charset='utf-8'){
- if($charset=='utf-8') $str = iconv('utf-8','gb2312',$str);
- $num = strlen($str);
- $cnNum = 0;
- for($i=0;$i<$num;$i++){
- if(ord(substr($str,$i+1,1))>127){
- $cnNum++;
- $i++;
- }
- }
- $enNum = $num-($cnNum*2);
- $number = ($enNum/2)+$cnNum;
- return ceil($number);
- }
- //测试输出长度都为15
- $str1 = '测试测试测试测试测试测试测试测';
- $str2 = 'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa';
- $str3 = 'aa测试aa测试aa测试aa测试aaaaaa';
- echo strLength($str1,'gb2312');
- echo strLength($str2,'gb2312');
- echo strLength($str3,'gb2312');
2.截取字符串函数
UTF8编码,在UTF8中,一个中文字符占3个字节
- $tmpstr = "";
- $strlen = $start + $len;
- for($i = 0; $i < $strlen; $i++){
- if(ord(substr($str, $i, 1)) > 127){
- $tmpstr.=substr($str, $i, 3);
- $i+=2;
- }else
- $tmpstr.= substr($str, $i, 1);
- }
- return $tmpstr;
- }
- echo msubstr("一二三天下致公english",0,10);
GB2312编码,在gb2312中,一个中文字符占2个字节
- function msubstr($str, $start, $len) { //ȡ
- $tmpstr = "";
- $strlen = $start + $len;
- if(preg_match('/[/d/s]{2,}/',$str)){ $strlen=$strlen-2;}
- for($i = 0; $i < $strlen; $i++) {
- if(ord(substr($str, $i, 1)) > 0xa0) {
- $tmpstr .= substr($str, $i, 2);
- $i++;
- } else
- $tmpstr .= substr($str, $i, 1);
- }
- return $tmpstr;
- }
- ?>
编码兼容性良好的函数
-
- {
- if(function_exists("mb_substr"))
- return mb_substr($str, $start, $length, $charset);
- elseif(function_exists('iconv_substr')) {
- return iconv_substr($str,$start,$length,$charset);
- }
- $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, $length));
- if($suffix) return $slice."…";
- return $slice;
- }