多个PHP中文字符串截取函数
字符串截取是一个非常常见的编程任务,而往往带中文的字符串截取会经常用到。虽然不难,但是自己写函数实现又耗费时间,这里介绍一个比较好用的字符串截取函数,能够胜任基本的需求了,代码如下:
- <?php
- function sysSubStr($string,$length,$append = false)
- {
- if(strlen($string) <= $length )
- {
- return $string;
- }
- else
- {
- $i = 0;
- while ($i < $length)
- {
- $stringTMP = substr($string,$i,1);
- if ( ord($stringTMP) >=224 )
- {
- $stringTMP = substr($string,$i,3);
- $i = $i + 3;
- }
- elseif( ord($stringTMP) >=192 )
- {
- $stringTMP = substr($string,$i,2);
- $i = $i + 2;
- }
- else
- {
- $i = $i + 1;
- }
- $stringLast[] = $stringTMP;
- }
- $stringLast = implode("",$stringLast);
- if($append)
- {
- $stringLast .= "...";
- }
- return $stringLast;
- }
- }
- //phpfensi.com
- $string = "简明现代魔法 —— 专注于互联网主流的各种技术";
- $length = "27";
- $append = true;
- echo sysSubStr($string,$length,$append);
- // 输出
- // 简明现代魔法 —— 专...
- ?>
截取GB2312中文字符串:
- <?php
- //截取中文字符串
- function mysubstr($str, $start, $len) {
- $tmpstr = "";
- $strlen = $start + $len;
- for($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 $tmpstr;
- }
- ?>
截取utf8编码的多字节字符串:
- <?php
- //截取utf8字符串
- function utf8Substr($str, $from, $len)
- {
- return preg_replace('#^(?:[\x00-\x7F]|[\xC0-\xFF][\x80-\xBF]+){0,'.$from.'}'.
- '((?:[\x00-\x7F]|[\xC0-\xFF][\x80-\xBF]+){0,'.$len.'}).*#s',
- '$1',$str);
- }
- ?>
UTF-8、GB2312都支持的汉字截取函数:
- <?php
- /*
- Utf-8、gb2312都支持的汉字截取函数
- cut_str(字符串, 截取长度, 开始长度, 编码);
- 编码默认为 utf-8
- 开始长度默认为 0
- */
- function cut_str($string, $sublen, $start = 0, $code = 'UTF-8')
- {
- if($code == 'UTF-8')
- {
- $pa = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|\xe0[\xa0-\xbf][\x80-\xbf]|[\xe1-\xef][\x80-\xbf][\x80-\xbf]|\xf0[\x90-\xbf][\x80-\xbf][\x80-\xbf]|[\xf1-\xf7][\x80-\xbf][\x80-\xbf][\x80-\xbf]/";
- preg_match_all($pa, $string, $t_string);
- if(count($t_string[0]) - $start > $sublen) return join('', array_slice($t_string[0], $start, $sublen))."...";
- return join('', array_slice($t_string[0], $start, $sublen));
- }
- else
- {
- $start = $start*2;
- $sublen = $sublen*2;
- $strlen = strlen($string);
- $tmpstr = '';
- for($i=0; $i< $strlen; $i++)
- {
- if($i>=$start && $i< ($start+$sublen))
- {
- if(ord(substr($string, $i, 1))>129)
- {
- $tmpstr.= substr($string, $i, 2);
- }
- else
- {
- $tmpstr.= substr($string, $i, 1);
- }
- }
- if(ord(substr($string, $i, 1))>129) $i++;
- }
- if(strlen($tmpstr)< $strlen ) $tmpstr.= "...";
- return $tmpstr;
- }
- }
- $str = "abcd需要截取的字符串";
- echo cut_str($str, 8, 0, 'gb2312');
- ?>