PHP intercepts strings, suitable for GB2312 and UTF8 encoding respectively_PHP tutorial

1. Intercept GB2312 Chinese string

Copy code The code is as follows:

//Intercept Chinese string
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. Intercept the utf8 encoded multi-byte string

Copy code The code is as follows:

//Intercept utf8 string
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. Chinese character interception function supported by UTF-8 and GB2312

Copy code The code is as follows:

/*
Chinese character interception function supported by Utf-8 and gb2312
cut_str(string, interception length, start length, encoding);
The encoding defaults to utf-8
The starting length defaults to 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 needs to intercept the string";
echo cut_str($str, 8, 0, 'gb2312');
?>

4. BugFree’s character interception function

Copy code The code is as follows:

/ **
* @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 <[email]wwccss@263.net[/email]>
* @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 = "www.at0915.cn";
$Length = "18";
$Append = false;
echo sysSubStr($String,$Length,$Append );
?>

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