the oct function converts a string into a number. prepend 0x to your string an pass it through the oct function 
print 0x1234+0x4321;#prints 21845
print '0x1234'+'0x4321';#prints 0
print oct('0x1234')+oct('0x4321); #prints 21845 

or

$a='0x1234';
$b='0x4321';
print oct($a)+oct($b);

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In reply to Re: Hex Question(s) by nikosv
in thread Hex Question(s) by deadlock

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