多個PHP中文字串截取函數_PHP教程

複製代碼 代碼如下:
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 = "簡明現代魔法 —— 專註於互連網主流的各種技術";
$length = "27";
$append = true;
echo sysSubStr($string,$length,$append);
// 輸出
// 簡明現代魔法 —— 專...
?>

截取GB2312中文字串：
複製代碼 代碼如下:
//截取中文字串
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編碼的多位元組字串：
複製代碼 代碼如下:
//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);
}
?>

UTF-8、GB2312都支援的漢字截取函數：
複製代碼 代碼如下:
/*
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< $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;
}
}

$str = "abcd需要截取的字串";
echo cut_str($str, 8, 0, 'gb2312');
?>

http://www.bkjia.com/PHPjc/825109.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/825109.htmlTechArticle複製代碼 代碼如下: ?php function sysSubStr($string,$length,$append = false) { if(strlen($string) = $length ) { return $string; } else { $i = 0; while ($i $length) { $string...

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