php使HTML标签自动补全闭合函数代码

<?php
/**
* 取HTML,并自动补全闭合
*
* param $html
*
* param $length
*
* param $end
*/
function subHtml($html, $length=50) {
$result = '';
$tagStack = array();
$len = 0;
$contents = preg_split("~(<[^>]+?>)~si", $html, -1, PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE);
foreach($contents as $tag) {
if (trim($tag) == "") continue;
if (preg_match("~<([a-z0-9]+)[^/>]*?/>~si", $tag)) {
$result .= $tag;
} else if (preg_match("~</([a-z0-9]+)[^/>]*?>~si", $tag, $match)) {
if ($tagStack[count($tagStack)-1] == $match[1]) {
array_pop($tagStack);
$result .= $tag;
}
} else if (preg_match("~<([a-z0-9]+)[^/>]*?>~si", $tag, $match)) {
array_push($tagStack, $match[1]);
$result .= $tag;
} else if (preg_match("~<!--.*?-->~si", $tag)) {
$result .= $tag;
} else {
if ($len + mstrlen($tag) < $length) {
$result .= $tag;
$len += mstrlen($tag);
} else {
$str = msubstr($tag, 0, $length - $len + 1);
$result .= $str;
break;
}
}
} while (!empty($tagStack)) {
$result .= '</' . array_pop($tagStack) . '>';
}
return $result;
}
/**
* 取中文字符串
*
* param $string 字符串
*
* param $start 起始位
*
* param $length 长度
*
* param $charset 编码
*
* param $dot 附加字串
*/
function msubstr($string, $start, $length, $dot = '', $charset = 'UTF-8') {
$string = str_replace(array('&amp;', '&quot;', '&lt;', '&gt;', '&nbsp;'), array('&', '"', '<', '>', ' '), $string);
if (strlen($string) <= $length) {
return $string;
}
if (strtolower($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++;
} elseif (194 <= $t && $t <= 223) {
$tn = 2;
$n += 2;
} elseif (224 <= $t && $t <= 239) {
$tn = 3;
$n += 3;
} elseif (240 <= $t && $t <= 247) {
$tn = 4;
$n += 4;
} elseif (248 <= $t && $t <= 251) {
$tn = 5;
$n += 5;
} elseif ($t == 252 || $t == 253) {
$tn = 6;
$n += 6;
} else {
$n++;
}
$noc++;
if ($noc >= $length) {
break;
}
}
if ($noc > $length) {
$n -= $tn;
}
$strcut = substr($string, 0, $n);
} else {
for($i = 0; $i < $length; $i++) {
$strcut .= ord($string[$i]) > 127 ? $string[$i] . $string[++$i] : $string[$i];
}
}
return $strcut . $dot;
}
/**
* 得字符串的长度，包括中英文。
*/
function mstrlen($str, $charset = 'UTF-8') {
if (function_exists('mb_substr')) {
$length = mb_strlen($str, $charset);
} elseif (function_exists('iconv_substr')) {
$length = iconv_strlen($str, $charset);
} else {
preg_match_all("/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|\xe0[\xa0-\xbf][\x80-\xbf]|[\xe1-\xef][\x80-\xbf][\x80-\xbf]|\xf0[\x90-\xbf][\x80-f][\x80-\xbf]|[\xf1-\xf7][\x80-\xbf][\x80-\xbf][\x80-\xbf]/", $text, $ar);
$length = count($ar[0]);
}
return $length;
}
$str = "<div><table>x<tr>1s<td>测试<td>124";
echo subHtml($str);
?>