PHP substr interception string garbled problem solution [utf8 and gb2312]_PHP tutorial

substr --- Get part of the string
Syntax: string substr (string string, int start [, int length])
Description:
substr() returns a part of the string Part of the string, specified by the parameters start and length.
If start is a positive number, the returned string will start from the start character of string.
Example:

Copy code The code is as follows:

$rest = substr (" abcdef", 1); // returns "bcdef"
$rest = substr ("abcdef", 1, 3); // returns "bcd"
?>

If start is a negative number, the returned string will start from the start character at the end of string.
Example:

Copy code The code is as follows:

$rest = substr (" abcdef", -1); // returns "f"
$rest = substr ("abcdef", -2); // returns "ef"
$rest = substr ("abcdef", -3, 1); // returns "d"
?>

If the parameter length is given and it is a positive number, the returned string will be length characters from start.
If the parameter length is given and is a negative number, the returned string will end at the length-th character from the end of string.
Example:

Copy code The code is as follows:

$rest = substr (" abcdef", 1, -1); // returns "bcde"
?>

dongyue,2005-01-07 11:10:41
substr --- Get Partial string
Syntax: string substr (string string, int start [, int length])
Description:
substr() returns a part of string, specified by parameters start and length .
If start is a positive number, the returned string will start from the start character of string.
Example:

Copy code The code is as follows:

$rest = substr (" abcdef", 1); // returns "bcdef"
$rest = substr ("abcdef", 1, 3); // returns "bcd"
?>

If start is a negative number, the returned string will start from the start character at the end of string.
Example:

Copy code The code is as follows:

$rest = substr (" abcdef", -1); // returns "f"
$rest = substr ("abcdef", -2); // returns "ef"
$rest = substr ("abcdef", -3, 1); // returns "d"
?>

If the parameter length is given and it is a positive number, the returned string will be length characters from start.
If the parameter length is given and is a negative number, the returned string will end at the length-th character from the end of string.
Example:

Copy code The code is as follows:

$rest = substr (" abcdef", 1, -1); // returns "bcde"
?>

Chinese character interception function supported by Utf-8 and gb2312

Copy code The code is as follows:

//Intercept Chinese string
/*
Utf-8 and gb2312 are supported Chinese character interception function
cut_str(string, interception length, starting length, encoding);
Encoding defaults to utf-8
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;
}
}
$str="Script House is a good website";
echo cut_str($str, 8, 5, 'gb2312');

http://www.bkjia.com/PHPjc/324655.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/324655.htmlTechArticlesubstr --- Get part of the string syntax: string substr (string string, int start [, int length] ) Description: substr() returns a part of string, specified by the parameters start and length...