帝国cms插件 截取字数时，显示内容的一部分保持html标签闭合

<?php 

echo subHtml("<div><table>x<tr>1s<td>测你<input name='11'/>你好我也好我们是非常也好我们是非常好的非常这好似一也好我们是非常好的非常这好似一也好我们是非常好的非常这好似一也好我们是非常好的非常这好似一也好我们是非常好的非常这好似一也好我们是非常好的非常这好似一也好我们是非常好的非常这好似一好的非常这好似一个这是一个故事的故事试<td>124",30);

 

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; 

} 

 

function msubstr($string, $start, $length, $dot = '', $charset = 'UTF-8') { 

$string = str_replace(array('&', '"', '<', '>', ' '), 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; 

} 

 

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; 

} 

?>