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How to check if a variable is undefined, null, or empty in php?

FairyBusiness
on
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Last Modified: 2012-08-31
I am wondering how do I check if a variable is undefined, null, or empty in php?

In javascript I would do the following:

if (type of variable === 'undefined')  // for undefined
if (variable === null) // for null
if (variable === '') // for empty

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but what about in php? Is it the same?
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