<?php
= "457736563527579860946" ;
$number_two = "244899980006764545657" ;
$answer = big_addition ( $number_one , $number_two );
$answer ;
big_addition ( $number_one , $number_two ) {
$carry = 0 ;
strlen ( $number_one ) > strlen ( $number_two )) {
$longer_length = strlen ( $number_one );
$shorter_length = strlen ( $number_two );
$set_one = $number_one ;
$zero_number = ( $longer_length - $shorter_length );
$zero_string = "" ;
$index = 1 ; $index <= $zero_number ; $index ++ ) {
$zero_string = $zero_string . "0" ;
$set_two = $zero_string . $number_two ;
$length = strlen ( $number_one );
strlen ( $number_one ) < strlen ( $number_two )) {
$longer_length = strlen ( $number_two );
$shorter_length = strlen ( $number_one );
$set_two = $number_two ;
$zero_number = ( $longer_length - $shorter_length );
$zero_string = "" ;
$index = 1 ; $index <= $zero_number ; $index ++ ) {
$zero_string = $zero_string . "0" ;
$set_one = $zero_string . $number_one ;
$length = strlen ( $number_two );
strlen ( $number_one ) == strlen ( $number_two )) {
$set_one = $number_one ;
$set_two = $number_two ;
$length = strlen ( $number_one );
$answer = "" ;
$index = ( $length - 1 ); $index >= 0 ; $index -- ) {
$digit = $carry + (( integer ) $set_one [ $index ]) + (( integer ) $set_two [ $index ]);
$digit_string = (( string ) $digit );
$digit >= 10 ) {
$answer = $answer . $digit_string [ 1 ];
$carry = ( integer ) $digit_string [ 0 ];
$answer = $answer . $digit_string ;
$carry = 0 ;
$carry != 0 ) {
$carry_string = (( string ) $carry );
$answer = $answer . $carry_string ;
$answer = strrev ( $answer );
$answer ;
?>
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