blocks|key|560781|text|这取决于您定义为html内容的内容。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|560782|最简单的事情是测试字符串是否包含html标记，这可以用regex来完成。|560783|<html.*>|code-block|syntax|javascript|560784|在php中，测试将是|560785|if+(preg_match('/<html.*>/',+$subject))+{
++++#+Successful+match
}+else+{
++++#+Match+attempt+failed
}|560786|如果你想看到你有有效的html，最好使用html解析器。|560787|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

That depends on what you define to be html contents.

The most straightforward thing is to test if the string contains the html tag which can be done with the regex

<pre><code>&lt;html.*&gt;
</code></pre>

In php the test will be

<pre><code>if (preg_match('/&lt;html.*&gt;/', $subject)) {
 # Successful match
} else {
 # Match attempt failed
}
</code></pre>

If you want to see you have valid html it's better to use a html parser.

blocks|key|560839|text|最简单的方法可能是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|560840|<?php

function+hasTags(+$str+)
{
++++return+!(strcmp(+$str,+strip_tags($str+)+)+==+0);
}

$str1+=+'something+with+<a+href="/some/url">html</a>+in.';
$str2+=+'a+string.';

var_dump(+hasTags(+$str1+)+);+//+true+-+has+tags.
var_dump(+hasTags(+$str2+)+);+//+false+-+no+tags.|code-block|syntax|javascript|560841|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

probably the easiest way would be something like:

<pre><code>&lt;?php

function hasTags( $str )
{
 return !(strcmp( $str, strip_tags($str ) ) == 0);
}

$str1 = '&lt;p&gt;something with &lt;a href="/some/url"&gt;html&lt;/a&gt; in.';
$str2 = 'a string.';

var_dump( hasTags( $str1 ) ); // true - has tags.
var_dump( hasTags( $str2 ) ); // false - no tags.
</code></pre>

blocks|key|344950|text|如果你想测试一个字符串是否包含一个"<something>"，(它是懒惰的，但可以为你工作)，你可以尝试这样做：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|344951|function+is_html($string)
{
++return+preg_match("/<[%5E<]%2B>/",$string,$m)+!=+0;
}|code-block|syntax|javascript|344952|entityMap^0|H|D|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

If you want to test if a string contains a <code>"&lt;something&gt;"</code>, (which is lazy but can work for you), you can try something like that :

<pre><code>function is_html($string)
{
 return preg_match("/&lt;[^&lt;]+&gt;/",$string,$m) != 0;
}
</code></pre>

blocks|key|344991|text|这是我想出来的|type|unstyled|depth|inlineStyleRanges|entityRanges|data|344992|function+isHtml($string){
+++++preg_match("/<\/?\w%2B((\s%2B\w%2B(\s*=\s*(?:\".*?\"%7C'.*?'%7C[%5E'\">\s]%2B))?)%2B\s*%7C\s*)\/?>/",$string,+$matches);
+++++if(count($matches)==0){
++++++++return+FALSE;
++++++}else{
+++++++++return+TRUE;
++++++}
}|code-block|syntax|javascript|344993|您只需传递一个字符串并检查它返回true还是false。就这么简单。|344994|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Here's what I came up with

<pre><code>function isHtml($string){
 preg_match("/&lt;\/?\w+((\s+\w+(\s*=\s*(?:\".*?\"|'.*?'|[^'\"&gt;\s]+))?)+\s*|\s*)\/?&gt;/",$string, $matches);
 if(count($matches)==0){
 return FALSE;
 }else{
 return TRUE;
 }
}
</code></pre>

You just pass a string and check if it returns true or false. As simple as that.

blocks|key|345046|text|我不使用正则表达式(就像这里的其他建议一样)，而是使用以下方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|345047|++++function+isHtml($string)
++++{
++++++++if+(+$string+!=+strip_tags($string)+)
++++++++{
++++++++++++return+true;+//+Contains+HTML
++++++++}
++++++++return+false;+//+Does+not+contain+HTML
++++}|code-block|syntax|javascript|345048|在这里，我使用PHP函数strip_tags从字符串中删除任何超文本标记语言。然后，它比较字符串，如果它们不匹配，则显示HTML标记。|offset|length|345049|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/manual/en/function.strip-tags.php^0|0|0|C|A|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

Instead of using regex (like the other suggestions here) I use the following method:

<pre><code> function isHtml($string)
 {
 if ( $string != strip_tags($string) )
 {
 return true; // Contains HTML
 }
 return false; // Does not contain HTML
 }
</code></pre>

Here I use a PHP function <a href="http://php.net/manual/en/function.strip-tags.php" rel="noreferrer">strip_tags</a> to remove any HTML from the string. It then compares the strings and if they do not match HTML tags were present.

blocks|key|561005|text|可以接受的答案是将包含HTML的字符串视为HTML，但显然不是。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|561006|我使用下面的方法，这可能是一个更好的主意，也可能不是。(欢迎评论。)|561007|function+isHTML(+$str+)+{+return+preg_match(+"/\/[a-z]*>/i",+$str+)+!=+0;+}|code-block|syntax|javascript|561008|这将查找包含在斜杠和右括号之间有零个或多个字母的/>的任何字符串。|561009|上面的函数返回：|561010|<something>+++++++++++++is+NOT+HTML
foo++++++++++++++is+HTML
foo++++++++++++++is+HTML
foo+++++++++++++++is+NOT+HTML
<input+/>+++++++++++++++is+HTML|561011|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|F|7|V|8|@]|9|@]|A|$G|H]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

The accepted answer will consider a string containing &lt;something&gt; as HTML which, obviously, it is not. 

I use the following, which may or may not be a better idea. (Comments appreciated.)

<pre><code>function isHTML( $str ) { return preg_match( "/\/[a-z]*&gt;/i", $str ) != 0; }
</code></pre>

This looks for any string containing /> with zero or more letters between the slash and closing bracket.

The above function returns:

<pre><code>&lt;something&gt; is NOT HTML
&lt;b&gt;foo&lt;/b&gt; is HTML
&lt;B&gt;foo&lt;/B&gt; is HTML
&lt;b&gt;foo&lt;b&gt; is NOT HTML
&lt;input /&gt; is HTML
</code></pre>

How can I check if PHP string contents contain any HTML contents?

I'm not good with Regular Expressions so I would like to have a function named "<code>is_html</code>" to check this. :) thank you!

How to check if string contents have any HTML in it?

如何检查PHP字符串内容是否包含HTML内容？我不擅长使用正则表达式，所以我希望有一个名为"is_html“的函数来检查这一点。:)谢谢！

问如何检查字符串内容中是否有HTML？
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