[PHP Learning] Implement the addition of two n-bit binary integers

This article talks about using PHP to add two n-bit binary integers. It has reference value. Interested friends can learn about it.

Question: Two n-bit binary numbers are stored in two n-element arrays A and B respectively. The sum of these two integers is stored in an n-element array C.
Answer: This question is mainly It is a problem of examining the carry of addition. Element 1 1 =0 and advances one bit
ADD-BINARY(A,B)
　C=new integer[A.length 1]
　　carry=0
for i=A.length downto 1
## C[i]=carry

The code is as follows:

<?php
function addBinary($A,$B){
        $C=array();
        $length=count($A);
        $carry=0;
        for($i=$length-1;$i>=0;$i--){
                //当前位的数字逻辑 1+1=0 1+0=1
                $C[$i+1]=($A[$i]+$B[$i]+$carry)%2;
                //进位的数字逻辑  1+1=1 1+0=0
                $carry=intval(($A[$i]+$B[$i]+$carry)/2);
        }   
        $C[$i+1]=$carry;
        return $C; 
}

$A=array(0,1,1,0);
$B=array(1,1,1,1);
$C=addBinary($A,$B);
var_dump($C);

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