PHP将两个数字数组组合为一个数组

Question

I need a new array combining 2 array with calculation

$array1 = array(2,5,7,1);

$array2 = array(1,3,2,5);

result array should out put

$array3 = array(3,8,9,6);

is this possible in php i know array_merge function combine two array but how combine after calculation

NOTE :

this is possible in C# but i want to know can i do it php as well

Answer 1

If they are guaranteed to be matched in size then you can use something like this

$array3 = array();

for($x =0; $x<count($array1); $x++){
     $array3[] = $array1[$x] + $array2[$x];
}

If the arrays are not guaranteed to be of the same size you can do the following

$array3 = array();
$max = max(count($array1), count($array2));
for($x =0; $x<$max; $x++){
     $array3[] = (isset($array1[$x])?$array1[$x]:0)) + (isset($array2[$x])?$array2[$x]:0));
}  

With the adoption of PHP 7 and it's null coalesce operator this code becomes much more readable:

$array3 = array();
$max = max(count($array1), count($array2));
for($x =0; $x<$max; $x++){
     $array3[] = ($array1[$x] ?? 0) + ($array2[$x] ?? 0);
}  

Answer 2

For this you have to use foreach loop

<?php
$array1 = array(2,5,7,1);
$array2 = array(1,3,2,5);
$array3= array();


foreach($array1 as $key=>$value)
{
   $array3[$key] = $array1[$key]+$array2[$key];
}

print_r($array3)
?>