PHP sikllarida massiv elementlarini jamlash

Keling, sikl yordamida massiv elementlarining yig‘indisini topamiz:

<?php
	$arr = [1, 2, 3, 4, 5];
	$res = 0;
	
	foreach ($arr as $elem) {
		$res += $elem;
	}
	
	echo $res;
?>

№1

Massiv berilgan:

<?php
	$arr = [2, 5, 9, 3, 1, 4];
?>

Ushbu massiv elementlarining yig'indisini toping.

№2

Massiv berilgan:

<?php
	$arr = [2, 5, 9, 3, 1, 4];
?>

Juft sonlar bo‘lgan elementlarning elementlari yig‘indisini toping.

№3

Massiv berilgan:

<?php
	$arr = [2, 5, 9, 3, 1, 4];
?>

Ushbu massiv elementlarining kvadratlari yig‘indisini toping.

№4

Massiv berilgan:

<?php
	$arr = [2, 5, 9, 3, 1, 4];
?>

Ushbu massiv elementlarining mahsulotini toping.