How can I determine whether a string contains html code?

How can I determine whether a string contains html code? How can I determine whether a string contains html code? Efficient and accurate code ------ solution ------------------ & lt ;? $ Str & quot; & lt; p & gt; x & quot; if (strip_tags ($ str )! $ Str) {& nbsp; echo & quot; hashtmltags & quot;} e how to determine whether the string contains html code?
How can I determine whether a string contains html code? Efficient and accurate code

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$ Str ="

X ";
If (strip_tags ($ str )! = $ Str ){
Echo "has html tags ";
} Else {echo "not have ";}
?>
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Follow the standard writing method. you only need to find whether "<" and ">" exists. there is nothing efficient and accurate! Use regular expressions.

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The third floor does not agree. <And> There may not be HTML tags.

But I don't know how efficient it is!
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Search for <"and">"

In principle, if the html contains non-html <And> , Should be converted to the object