comparison operator

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i ran into this problem and i dont remember how i worked around it.

if($_REQUEST['value'] == 1)
{
 // do something
}
else if($_REQUEST['value'] == 0)
{
 // do something
}

even if i don't do ?value=0 its always prints something.. i want to make an
on/off value based on the value of the url.. 1 for yes, 0 for no. but i only
want false IF its declared in the url..

i dont want to use a number other than 0, workaround?

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