There are two ways you can do it, one is using a regular expression the other is comparing strings.

First the regular expression approach:

if (preg_match("/([\<])([^\>]{1,})*([\>])/i", $string)) {
echo "string contains html";

And here is the other approach:

if(strlen($string) != strlen(strip_tags($string)){
echo "string contains HTML";

How to check whether a string contains HTML using PHP

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