PHP 截取字符串函数整理(支持gb2312和utf-8)_php技巧

1、截取GB2312字符用的函数

PHP代码

 <BR><?php <BR>//截取中文字符串 <BR>function mysubstr($str, $start, $len) { <BR>$tmpstr = ""; <BR>$strlen = $start + $len; <BR>for($i = 0; $i < $strlen; $i++) { <BR>if(ord(substr($str, $i, 1)) > 0xa0) { <BR>$tmpstr .= substr($str, $i, 2); <BR>$i++; <BR>} else <BR>$tmpstr .= substr($str, $i, 1); <BR>} <BR>return $tmpstr; <BR>} <BR>?> <BR>

2. 截取utf8编码的多字节字符串

PHP代码

 <BR><?php <BR>//截取utf8字符串 <BR>function utf8Substr($str, $from, $len) <BR>{ <BR>return preg_replace('#^(?:[\x00-\x7F]|[\xC0-\xFF][\x80-\xBF]+){0,'.$from.'}'. <BR>'((?:[\x00-\x7F]|[\xC0-\xFF][\x80-\xBF]+){0,'.$len.'}).*#s', <BR>'$1',$str); <BR>} <BR>?> <BR>

3. UTF-8、GB2312都支持的汉字截取函数

PHP代码

 <BR><?php <BR>/* <BR>Utf-8、gb2312都支持的汉字截取函数 <BR>cut_str(字符串, 截取长度, 开始长度, 编码); <BR>编码默认为 utf-8 <BR>开始长度默认为 0 <BR>*/ <br><br>function cut_str($string, $sublen, $start = 0, $code = 'UTF-8') <BR>{ <BR>if($code == 'UTF-8') <BR>{ <BR>$pa = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|\xe0[\xa0-\xbf][\x80-\xbf]|[\xe1-\xef][\x80-\xbf][\x80-\xbf]|\xf0[\x90-\xbf][\x80-\xbf][\x80-\xbf]|[\xf1-\xf7][\x80-\xbf][\x80-\xbf][\x80-\xbf]/"; <BR>preg_match_all($pa, $string, $t_string); <br><br>if(count($t_string[0]) - $start > $sublen) return join('', array_slice($t_string[0], $start, $sublen))."..."; <BR>return join('', array_slice($t_string[0], $start, $sublen)); <BR>} <BR>else <BR>{ <BR>$start = $start*2; <BR>$sublen = $sublen*2; <BR>$strlen = strlen($string); <BR>$tmpstr = ''; <br><br>for($i=0; $i< $strlen; $i++) <BR>{ <BR>if($i>=$start && $i< ($start+$sublen)) <BR>{ <BR>if(ord(substr($string, $i, 1))>129) <BR>{ <BR>$tmpstr.= substr($string, $i, 2); <BR>} <BR>else <BR>{ <BR>$tmpstr.= substr($string, $i, 1); <BR>} <BR>} <BR>if(ord(substr($string, $i, 1))>129) $i++; <BR>} <BR>if(strlen($tmpstr)< $strlen ) $tmpstr.= "..."; <BR>return $tmpstr; <BR>} <BR>} <br><br>$str = "abcd需要截取的字符串"; <BR>echo cut_str($str, 8, 0, 'gb2312'); <BR>?> <BR>

4. BugFree 的字符截取函数

PHP代码

 <BR><?php <BR>/** <BR>* @package BugFree <BR>* @version $Id: FunctionsMain.inc.php,v 1.32 2005/09/24 11:38:37 wwccss Exp $ <BR>* <BR>* <BR>* Return part of a<p>5本文来源gao!daima.com搞$代!码#网#</p><pre>搞代gaodaima码

string(Enhance the function substr())
*
* @author Chunsheng Wang
* @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 = “book.chinaz.com — 站长书库、站长教程”;
$Length = “18”;
$Append = false;
echo sysSubStr($String,$Length,$Append);
?>

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