What should I do if the php output html code is not parsed?

Solution to the problem that the html code output by php is not parsed: 1. Use PHP to set the encoding, code such as "header("Content-type:...charset=utf-8")"; 2. Use meta tags Set encoding, code such as "".

The operating environment of this article: Windows7 system, PHP7.1 version, DELL G3 computer

What should I do if the html code output by php does not parse? ?

php echo html content was parsed, what happened, as shown in the figure

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<p><?php<br/>    header(&#39;Content-Type:text/plain;charset=utf-8&#39;);    echo "helloword";    echo "<hr>";     <br/>?><br/></p>

After checking, it is because of header(' Content-Type: text/plain;charset=utf-8'); This sentence of code affects it.

Here we need to distinguish between text/html and text/plain: text/html is output in the form of html, for example, a text box will be displayed on the page, and in plain form, this paragraph will be displayed on the page as it is. Code

Then there are two ways to modify it

1. Use PHP to set the encoding

<p> <?php<br/>    header("Content-type: text/html; charset=utf-8");  <br/>    echo "<a href=&#39;http://s.jf3q.com&#39;>helloword</a>";    echo "<hr>"; <br/>?><br/></p>

2. Use meta tag

<p>    <meta charset="UTF-8"><br/> <?php<br/>        echo "helloword";    echo "<hr>";?><br/></p>

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