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php echo html tag so it is viewable (not interpreted as code)

I am currently trying to echo a text value from a variable which contains html-style tags. <...>

$string = "variable_name";
$tag_str = "<".$string.">";
echo $tag_str;

currently this echo's as nothing as it believes it is html code. How would I go about echoing <variable_name> to the page so it is viewable and not interpreted as code by the browser?

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You'll have to html encode your output

$string = "variable_name";
$tag_str = "<".$string.">";
echo htmlspecialchars($tag_str);

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