What's different between "isset($string)" & "@$string" on PHP? -

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what's different between isset($string) , @$string in php ?

this works both ways, what's difference?

if(isset($string))  ....   if(@$string)  ....

function isset() check variable , return true if variable exists. sign @ ignore error. give same values. next code maybe show it:

   if(isset($string))       print 1; // no print    if(@$string)       print 2; // no print     $string = false;    if(isset($string))       print 3; // print 3    if(@$string)       print 4; // no print

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