PHP intercepts Chinese string functions ~ including GB2312 and UT-8

<?php
/*
Chinese character interception function supported by Utf-8 and gb2312
Cut_str (string, intercept length, start length, encode);
encoding defaults to Utf-8
Start 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;
$sublen = $sublen;
$strlen = strlen ($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;
}
}

$str = "ABCD string to intercept";
Echo Cut_str ($STR, 8, 0, ' gb2312 ');
?>


<?php
Intercept Chinese strings
Support GB2312
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;
}
?>



<?php
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 ',
' $ ', $str);
}
?>

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