php中截取中文字符串

[cc lang='php' width='750']
/**
*
* 中文字符串截取
* @param string $string
* @param int $sublen
* @param int $start
* @param string $code
*/
function substr_zh($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;
}
}
[/cc]

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