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On my client side, I have a rich text area where the user is allowed to enter HTML. Then, how on PHP do i ensure that the PHP is safe. Is there any validation in php for checking HTML??
from safe I mean that the HTML does not contain any malicious code
You’ll want to sanitize your input before saving it. http://htmlpurifier.org/ does a great job and is pretty easy to implement and insanely configurable.