How do I retrieve form values when using check boxes? HTML/PHP?

I have a form that submits to another page as per usual. How do i read the values checked in the previous page?

Here is a simplified version of my code:

<form action="availability.php" method="post">
<input type="checkbox" name="sat7-9" value="sat7-9" />
<input type="checkbox" name="sun9-11" value="sun9-11" />
<input type="submit" name="submit" value="Done" />
<input type="hidden" name="submitted" value="TRUE" />
</form>
 
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