PHP interception string function sorting (supports gb2312 and utf-8)_PHP tutorial

1. Function used to intercept GB2312 characters

PHP code

Copy code The code is as follows:

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

PHP code

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

PHP code

Copy code The code is as follows:

/*
Chinese character interception function supported by Utf-8 and gb2312
cut_str (string, interception length, starting length, encoding);
The default encoding is utf-8
The default starting length is 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;
}
}

$str = "abcd needs to intercept the string";
echo cut_str($str, 8, 0, 'gb2312');
?>

4 . BugFree’s character interception function

PHP code

Copy code The code is as follows:

< ;?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
* @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) {
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 -- Webmaster Library, Webmaster Tutorial";
$Length = "18";
$Append = false;
echo sysSubStr($String,$Length,$Append);
?>

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