function getIntAdd($a,$b){$c = '';$bCount = strlen($b);$aCount = strlen($a);$count = max($bCount,$aCount);$aDiff = $count - $aCount;$bDiff = $count - $bCount;for($i = $count - 1;$i >= 0;$i--){$aVal = $count - $i <= $aCount ? intval($a[$i - $aDiff]) : 0;$bVal = $count - $i <= $bCount ? intval($b[$i - $bDiff]) : 0;$v = $aVal + $bVal;if(strlen($c) > 0 && strlen($c) >= $count - $i){$c = ($v + intval($c[0])).substr($c,1,strlen($c) - 1);}else{$c = $v.$c.'';}}return $c;}$a = '23490234328490289048902384908392849238';$b = '234320498324982390489328498230984982399290384902384';$c = getIntAdd($a,$b);print_r($c);