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2012年10月24日—isset()canbeappropriatewhenyouspecifyakeywithin$_POSTANDwanttoallowafalseyvaluelike0.Particulartoemailvaluesubmissions, ...,2022年5月28日—Ihaveaformononepagethatsubmitstoanotherpage.WhatitdoesisitchecksifthemailisfilledbutwhenIsend...
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Ifavariablehasbeenunsetwiththeunset()function,itisnolongerconsideredtobeset.isset()willreturnfalsewhencheckingavariablethathasbeen ...
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