PHP sikllarynda massiw elementlerini ýygnamak

Gelin, sikl kömegi bilen massiw elementleriniň jemini tapalyň:

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

Задание 1

Massiw berlen:

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

Bu massiw elementleriniň jemini tapyň.

Задание 2

Massiw berlen:

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

Jübüt sanlar bolan elementleriň jemini tapyň.

Задание 3

Massiw berlen:

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

Bu massiw elementleriniň kwadratlarynyň jemini tapyň.

Задание 4

Massiw berlen:

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

Bu massiw elementleriniň köpeltmek hasylyny tapyň.