$arr = array (1,2,3,4,5,6,7,8,9,10); how do I add only even numbers within the php array?

Question

have an Array:

$arr = array (1,2,3,4,5,6,7,8,9,10);

I would like to know how to add only even numbers within the array of the vector in PHP?

Answer 1

Use the function array_reduce which reduces an array to a single value through an iterative process via callback function.

<?php

$arr = array (1,2,3,4,5,6,7,8,9,10);

//Para cada elemento array aplica uma função redutora
$soma = array_reduce($arr, function($carry, $item){  
  //Testa par ver se o número é par se for soma o elemento senão mantém o valor
  return $item % 2 == 0 ? $carry + $item : $carry;
});

echo $soma;

^{Test in Repl.it}

Another possibility is to iterate over the array elements and test to see if they are even

<?php

$arr = array (1,2,3,4,5,6,7,8,9,10);

$soma = 0;

//Para cada elemento do array
foreach($arr as $item){
   if ($item % 2 == 0) $soma += $item; //O Soma apenas se for par
}

echo $soma;

^{Test in Repl.it}