htmlentities() does not remove escape

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Hello:
I have a form that has a textarea and I do not want to
disallow the use of single quote as apostrophe, or
for any other normal stylization. So I am using html
entities to change these characters into html entities.
But the function does not remove the escapes added
by the browser when sending the input.
Is there a special function in php for removing the \ escapes
as well?
My plan b would be to look for a similar function in javascript
and convert to html entities before the input is sent to the
server.
I want to screen for damaging code but do not want to
prevent legitimate use of punctuation. If the input in the
text field is then displayed as html (which it will be) I do
not want things like 'It\'s a nice day' showing up in the
html.
Thanks in advance;
Jeff k

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