php 截取中文

2024-05-04 21:52:46

字體：大中小

供稿：網(wǎng)友

<?php
< ?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;
}
?>

2. 截取utf8編碼的多字節(jié)字符串
<?php
< ?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);
}
?>

3. UTF-8、GB2312都支持的漢字截取函數(shù)
<?php
< ?php
/*
Utf-8、gb2312都支持的漢字截取函數(shù)
cut_str(字符串, 截取長度, 開始長度, 編碼);
編碼默認(rèn)為 utf-8
開始長度默認(rèn)為 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');
?>

4. BugFree 的字符截取函數(shù)
<?php
< ?php
/**
* @package BugFree
* @version Id: FunctionsMain.inc.php,v 1.32 2005/09/24 11:38:37 wwccss Exp
*
*
* Return part of a string(Enhance the function substr())
*
* @author Chunsheng Wang <wwccss@263.net>
* @param string String the string to cut.
* @param int Length the length of returned string.
* @param booble Append whether append "...": false|true
* @return string the cutted string.
*/
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;
}
}

String = "CodeBit.cn -- 簡單、精彩、通用";
Length = "18";
Append = false;
echo sysSubStr(String,Length,Append);
?>

上一篇：解析PHP漢字驗(yàn)證碼的實(shí)現(xiàn)

下一篇：淺析動(dòng)態(tài)網(wǎng)頁技術(shù)PHP中錯(cuò)誤處理的一些方法