php htmlentities

I am trying to put some php code on my page, and I am running into a problem with people filling out single quotes on their form
I tried putting this
htmlentities ($_POST['ReferenceNum2']) 

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Why is it not replacing the single quotes properly?
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Marco GasiFreelancerCommented:
Use htmlspecialchars instead:

$ReferenceNum2 = htmlspecialchars($_POST['ReferenceNum2'], ENT_QUOTES);

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Ray PaseurCommented:
What are you trying to do with the client input?  Different usage cases need different handling.  If you're putting it into a database, you escape the data.  If you're echoing it to the client browser you escape the data.  But (unfortunately) the meanings of "escape" are different in these cases.

Please tell us a little more and maybe we can give more specific recommendations.

If you're new to PHP this article may help you find some good learning resources.
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