blocks|key|458977|text|substr(strip_tags($content)，0,100)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|458978|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

substr(strip_tags($content), 0, 100)

blocks|key|459036|text|几个月前，我创建了一个特殊的函数来解决你的问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|459037|下面是一个函数：|459038|function+substr_close_tags($code,+$limit+=+300)
{
++++if+(+strlen($code)+<=+$limit+)
++++{
++++++++return+$code;
++++}

++++$html+=+substr($code,+0,+$limit);
++++preg_match_all+(+"#<([a-zA-Z]%2B)#",+$html,+$result+);

++++foreach($result[1]+AS+$key+=>+$value)
++++{
++++++++if+(+strtolower($value)+==+'br'+)
++++++++{
++++++++++++unset($result[1][$key]);
++++++++}
++++}
++++$openedtags+=+$result[1];

++++preg_match_all+(+"#</([a-zA-Z]%2B)>#iU",+$html,+$result+);
++++$closedtags+=+$result[1];

++++foreach($closedtags+AS+$key+=>+$value)
++++{
++++++++if+(+($k+=+array_search($value,+$openedtags))+===+FALSE+)
++++++++{
++++++++++++continue;
++++++++}
++++++++else
++++++++{
++++++++++++unset($openedtags[$k]);
++++++++}
++++}

++++if+(+empty($openedtags)+)
++++{
++++++++if+(+strpos($code,+'+',+$limit)+==+$limit+)
++++++++{
++++++++++++return+$html."...";
++++++++}
++++++++else
++++++++{
++++++++++++return+substr($code,+0,+strpos($code,+'+',+$limit))."...";
++++++++}
++++}

++++$position+=+0;
++++$close_tag+=+'';
++++foreach($openedtags+AS+$key+=>+$value)
++++{+++
++++++++$p+=+strpos($code,+('</'.$value.'>'),+$limit);

++++++++if+(+$p+===+FALSE+)
++++++++{
++++++++++++$code+.=+('</'.$value.'>');
++++++++}
++++++++else+if+(+$p+>+$position+)
++++++++{
++++++++++++$close_tag+=+'</'.$value.'>';
++++++++++++$position+=+$p;
++++++++}
++++}

++++if+(+$position+==+0+)
++++{
++++++++return+$code;
++++}

++++return+substr($code,+0,+$position).$close_tag."...";
}|code-block|syntax|javascript|459039|这里是演示：http://sandbox.onlinephpfunctions.com/code/899d8137c15596a8528c871543eb005984ec0201+(点击“执行代码”来检查它是如何工作的)。|offset|length|459040|entityMap|0|LINK|mutability|MUTABLE|url|http://sandbox.onlinephpfunctions.com/code/899d8137c15596a8528c871543eb005984ec0201^0|0|0|0|6|2B|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|X|8|@]|9|@$K|Y|L|Z|1|10]]|A|$]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

A few mounths ago I created a special function which is solution for your problem.

Here is a function:

<pre><code>function substr_close_tags($code, $limit = 300)
{
 if ( strlen($code) &lt;= $limit )
 {
 return $code;
 }

 $html = substr($code, 0, $limit);
 preg_match_all ( "#&lt;([a-zA-Z]+)#", $html, $result );

 foreach($result[1] AS $key =&gt; $value)
 {
 if ( strtolower($value) == 'br' )
 {
 unset($result[1][$key]);
 }
 }
 $openedtags = $result[1];

 preg_match_all ( "#&lt;/([a-zA-Z]+)&gt;#iU", $html, $result );
 $closedtags = $result[1];

 foreach($closedtags AS $key =&gt; $value)
 {
 if ( ($k = array_search($value, $openedtags)) === FALSE )
 {
 continue;
 }
 else
 {
 unset($openedtags[$k]);
 }
 }

 if ( empty($openedtags) )
 {
 if ( strpos($code, ' ', $limit) == $limit )
 {
 return $html."...";
 }
 else
 {
 return substr($code, 0, strpos($code, ' ', $limit))."...";
 }
 }

 $position = 0;
 $close_tag = '';
 foreach($openedtags AS $key =&gt; $value)
 { 
 $p = strpos($code, ('&lt;/'.$value.'&gt;'), $limit);

 if ( $p === FALSE )
 {
 $code .= ('&lt;/'.$value.'&gt;');
 }
 else if ( $p &gt; $position )
 {
 $close_tag = '&lt;/'.$value.'&gt;';
 $position = $p;
 }
 }

 if ( $position == 0 )
 {
 return $code;
 }

 return substr($code, 0, $position).$close_tag."...";
}
</code></pre>

Here is DEMO: <a href="http://sandbox.onlinephpfunctions.com/code/899d8137c15596a8528c871543eb005984ec0201" rel="noreferrer">http://sandbox.onlinephpfunctions.com/code/899d8137c15596a8528c871543eb005984ec0201</a> (click "Execute code" to check how it works).

blocks|key|673324|text|使用@newbieuser他的函数时，我遇到了同样的问题，就像@pablo-pazos一样，当$limit掉进一个html标签(在我的例子中是r处的<br+/>+)时，它是(不)中断的。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|673325|使用一些代码进行了修复|673326|if+(+strlen($code)+<=+$limit+){
++++return+$code;
}

$html+=+substr($code,+0,+$limit);+++++++

//We+must+find+a+.+or+>+or+space+so+we+are+sure+not+being+in+a+html-tag!
//In+my+case+there+are+only+ 
//If+you+have+more+tags,+or+html+formatted+text,+you+must+do+a+little+more+and+also+use+something+like+http://htmlpurifier.org/demo.php

$_find_last_char+=+strrpos($html,+".")%2B1;
if($_find_last_char+>+$limit/3*2){
++++$html_break+=+$_find_last_char;
}else{
++++$_find_last_char+=+strrpos($html,+">")%2B1;
++++if($_find_last_char+>+$limit/3*2){+
++++++++$html_break+=+$_find_last_char;
++++}else{
++++++++$html_break+=+strrpos($html,+"+");
++++}
}

$html+=+substr($html,+0,+$html_break);
preg_match_all+(+"#<([a-zA-Z]%2B)#",+$html,+$result+);
......|code-block|syntax|javascript|673327|entityMap^0|22|6|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|R|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|S|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

Using @newbieuser his function, I had the same issue, like @pablo-pazos, that it was (not) breaking when $limit fell into an html tag (in my case <code>&lt;br /&gt;</code> at the r) 

Fixed with some code

<pre><code>if ( strlen($code) &lt;= $limit ){
 return $code;
}

$html = substr($code, 0, $limit); 

//We must find a . or &gt; or space so we are sure not being in a html-tag!
//In my case there are only &lt;br&gt;
//If you have more tags, or html formatted text, you must do a little more and also use something like http://htmlpurifier.org/demo.php

$_find_last_char = strrpos($html, ".")+1;
if($_find_last_char &gt; $limit/3*2){
 $html_break = $_find_last_char;
}else{
 $_find_last_char = strrpos($html, "&gt;")+1;
 if($_find_last_char &gt; $limit/3*2){ 
 $html_break = $_find_last_char;
 }else{
 $html_break = strrpos($html, " ");
 }
}

$html = substr($html, 0, $html_break);
preg_match_all ( "#&lt;([a-zA-Z]+)#", $html, $result );
......
</code></pre>

I am wondering if there is an elegant way to trim some text but while being HTML tag aware?

For example, I have this string:

<pre><code>$data = '&lt;strong&gt;some title text here that could get very long&lt;/strong&gt;';
</code></pre>

And let's say I need to return/output this string on a page but would like it to be no more than X characters. Let's say 35 for this example.

Then I use:

<pre><code>$output = substr($data,0,20);
</code></pre>

But now I end up with: 

<pre><code>&lt;strong&gt;some title text here that 
</code></pre>

which as you can see the closing strong tags are discarded thus breaking the HTML display.

Is there a way around this? Also note that it is possible to have multiple tags in the string for example:

<pre><code>&lt;p&gt;some text here &lt;strong&gt;and here&lt;/strong&gt;&lt;/p&gt;
</code></pre>

PHP substr but keep HTML tags?

我想知道是否有一种优雅的方法来裁剪一些文本，同时又能识别HTML标签？例如，我有这样的字符串：$data = 'some title text here that could get very long';假设我需要在页面上返回/输出这个字符串，但希望它不超过X个字符。在这个例子中，我...

问PHP子字符串，但保留HTML标记？
EN

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