前端之家收集整理的这篇文章主要介绍了
PHP 截取中文长度函数，
前端之家小编觉得挺不错的，现在分享给大家，也给大家做个参考。
<?PHP
define('CHARSET','utf-8');
function cutstr($string,$length,$dot = ' ...') {
if(strlen($string) <= $length) {
return $string;
}
$pre = '{%';
$end = '%}';
$string = str_replace(array('&','"','<','>'),array($pre.'&'.$end,$pre.'"'.$end,$pre.'<'.$end,$pre.'>'.$end),$string);
$strcut = '';
if(strtolower(CHARSET) == 'utf-8') {
$n = $tn = $noc = 0;
while($n < strlen($string)) {
$t = ord($string[$n]);
if($t == 9 || $t == 10 || (32 <= $t && $t <= 126)) {
$tn = 1; $n++; $noc++;
} elseif(194 <= $t && $t <= 223) {
$tn = 2; $n += 2; $noc += 2;
} elseif(224 <= $t && $t <= 239) {
$tn = 3; $n += 3; $noc += 2;
} elseif(240 <= $t && $t <= 247) {
$tn = 4; $n += 4; $noc += 2;
} elseif(248 <= $t && $t <= 251) {
$tn = 5; $n += 5; $noc += 2;
} elseif($t == 252 || $t == 253) {
$tn = 6; $n += 6; $noc += 2;
} else {
$n++;
}
if($noc >= $length) {
break;
}
}
if($noc > $length) {
$n -= $tn;
}
$strcut = substr($string,$n);
} else {
for($i = 0; $i < $length; $i++) {
$strcut .= ord($string[$i]) > 127 ? $string[$i].$string[++$i] : $string[$i];
}
}
$strcut = str_replace(array($pre.'&'.$end,array('&',$strcut);
return $strcut.$dot;
}
?>
/*** 来自编程之家 jb51.cc（jb51.cc） ***/
