1.截取GB2312字元用的函數
PHP程式碼
複製程式碼 程式碼如下:
function mysubstr($str, $start, $len) {
$tmpstr = "";
$strlen = $start + $len;
for($ i = 0; $i if(ord(substr($str, $i, 1)) > 0xa0) {
$tmpstr .= substr($str, $i , 2);
$i++;
} else
$tmpstr .= substr($str, $i, 1);
}
return $tmpstr;
}
?>
2. 截取utf8編碼的多位元組字串
複製程式碼複製程式碼
程式碼如下:
//截取utf8字串
function utf8Substr($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);
}
PHP程式碼複製程式碼
程式碼如下：
複製程式碼
程式碼如下:
/*
Utf-8、gb2312都支援的漢字截取函數
cut_str(字串, 截取長度, 開始長度, 編碼);
編碼預設為utf-8
開始長度預設為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; $i{
if($i>=$start && $i{
if(ord(substr($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)return $tmpstr;
}
}
4. BugFree 的字元截取函數PHP程式碼
複製程式碼
程式碼如下:
function sysSubStr($String,$Length,$Append = false)
{
if (strlen($String) {
return $String;
}
else
{
$I = 0;
while ($I {
$StringTMP = substr($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 = "book.chinaz.com -- 站長書庫、站長教學";
$Length = "18";
$Append = false;
echo sysSubStr($String,$ Length,$Append);
?>
以上就介紹了楷體 gb2312 PHP 截取字串函數整理支援gb2312和utf-8，包括了楷體 gb2312方面的內容，希望對PHP教程有興趣的朋友有所幫助。
