a-very-big-sum.php

<?php

// Complete the aVeryBigSum function below.
function aVeryBigSum($ar) {
	$sum = 0;
 foreach($ar as $number){
	 $sum += $number;
 }
 return $sum;
}

$fptr = fopen("OUTPUT_PATH.txt", "w");

$stdin = fopen("php://stdin", "r");

fscanf($stdin, "%d\n", $ar_count);

fscanf($stdin, "%[^\n]", $ar_temp);

$ar = array_map('intval', preg_split('/ /', $ar_temp, -1, PREG_SPLIT_NO_EMPTY));

$result = aVeryBigSum($ar);

fwrite($fptr, $result . "\n");

fclose($stdin);
fclose($fptr);