php does not parse html code

php does not parse html code?

php echo html content is parsed, what is going on, as shown in the figure

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

After checking, it is because 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, while in plain form it will be output as it is on the page. Display this code

There are two ways to modify it

1. Use PHP to set the encoding

 <?php
    header("Content-type: text/html; charset=utf-8");  
    echo "<a href=&#39;xxx&#39;>helloword</a>";
    echo "<hr>"; 
?>

2. Use meta tags

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

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