PHP截取中文字符串函数总结
在网上看到有很多关于截取中文字符串的一些函数,在此本文章就为各位整理一下这些常用的截取中文字符串的例子吧,希望例子能帮助到大家哦.
常用的php函数:
- strstr(string,string) //从前面第一次出现某个字符串的地方截取到最后
- strrchr(string,string) //从某个字符串从最后出现的位置截取到结尾
- strpos(string,string[,int]) //某个字符串第一次出现的位置
- strrpos(string,string) //某个字符串最后一次出现的位置
- substr(string,int[,int]) //从指定位置开始截取字符串,可以指定截取的长度。
- strlen(string) //获取字符串的长度PHP截取开始和结束标记间的字符
方法一:利用explode对字符串进行分,代码如下:
- /**
- * Get the content between $start and $end
- *
- * @param string $content 原始字符
- * @param string $start 起始字符
- * @param string $end 结束字符
- * @return string
- */
- function GetStringBetween($content,$start,$end){
- $r = explode($start, $content);
- if (isset($r[1])){
- $r = explode($end, $r[1]);
- return $r[0];
- }
- return '';
- }
方法二:利用substr截取字符,由于php组件函数,因此字符串处理效率比explode方法要高一些,代码如下:
- /**
- * Get the content between $start and $end
- *
- * @param string $content 原始字符
- * @param string $start 起始字符
- * @param string $end 结束字符
- * @return string
- */
- function get_string_between($string, $start, $end){
- $string = " ".$string; //开源软件:phpfensi.com
- $ini = strpos($string,$start);
- if ($ini == 0) return "";
- $ini += strlen($start);
- $len = strpos($string,$end,$ini) - $ini;
- return substr($string,$ini,$len);
- }
PHP截取所有符合起始与结束标记的字符串,代码如下:
- /**
- * Get all every strings between two tags
- *
- * @param string $string 原始字符串
- * @param string $start 起始字符串
- * @param string $end 结束字符串
- * @return array
- */
- function get_all_strings_between($string,$start,$end)
- {
- //Returns an array of all values which are between two tags in a set of data
- $strings = array();
- $startPos = 0;
- $i = 0;
- //echo strlen($string)."n";
- while($startPos < strlen($string) && $matched = get_string_between(substr($string,$startPos),$start,$end))
- {
- if ($matched == null || $matched[1] == null || $matched[1] == '') break;
- $startPos = $matched[0]+$startPos+1;
- array_push($strings,$matched[1]);
- $i++;
- }
- return $strings;
- }
- function get_string_between($string, $start, $end){
- $ini = strpos($string,$start);
- if ($ini == 0) return null;
- $ini += strlen($start);
- $len = strpos($string,$end,$ini) - $ini;
- return array($ini+$len,substr($string,$ini,$len));
- }
php截取起始与结束标记间字符,带截取次数,是否允许重复选项,代码如下:
- /**
- * Get all every strings between two tags
- *
- * @param string $string 原始字符串
- * @param string $start 起始字符串
- * @param string $end 结束字符串
- * @return array
- */
- function get_all_strings_between($string,$start,$end)
- {
- //Returns an array of all values which are between two tags in a set of data
- $strings = array();
- $startPos = 0;
- $i = 0;
- //echo strlen($string)."n";
- while($startPos < strlen($string) && $matched = get_string_between(substr($string,$startPos),$start,$end))
- {
- if ($matched == null || $matched[1] == null || $matched[1] == '') break;
- $startPos = $matched[0]+$startPos+1;
- array_push($strings,$matched[1]);
- $i++;
- }
- return $strings;
- }
- function get_string_between($string, $start, $end){
- $ini = strpos($string,$start);
- if ($ini == 0) return null;
- $ini += strlen($start);
- $len = strpos($string,$end,$ini) - $ini;
- return array($ini+$len,substr($string,$ini,$len));
- }
截取GB2312中文字符串,代码如下:
- <?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 $tmpstr;
- }
- ?>
截取utf8编码的多字节字符串,代码如下:
- <?php
- //截取utf8字符串
- function utf8Substr($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);
- }
- ?>