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How I can block HTML codes in my form? So, when someone enter a HTML code, it's not usable...

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http://www.php.net/manual/en/function.htmlspecialchars.php

htmlspecialchars()

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It's much better to either escape HTML so it's displayed in the browser or to detect if the content has HTML and display an error such as "HTML not allowed" instead of removing the HTML. By removing or replacing content, you can end up with a much bigger problem en.wikipedia.org/wiki/Scunthorpe_problem
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You could just use strip_tags.

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You would want to use HTMLEntities. It will escape all special entities like <>.

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