passubg argynebts by reference

1function Myfuction {
2  echo "Hello World!";
3}
4

1
2  <?php
3function add_number(&$value) {
4  $value += 5;
5}
6
7$add  = 2;
8add_number($add);
9
10  echo $add;
11?>  

1
2 <?php declare(strict_types=1); // strict requirement
3function sum(int $x, 
4  int $y) {
5  $z = $x + $y;
6  return $z;
7}
8
9
10 echo "5 + 10 = " . sum(5, 10) . "<br>";
11echo "7 + 13 = " . sum(7, 13) . "<br>";
12echo "2 + 4 = " . sum(2, 4);
13?> 

1myFunction {
2  echo "Hello World!";
3}
4

1
2  <?php declare(strict_types=1); // strict requirement
3function addNumbers(float 
4  $a, float $b) : float {
5  return $a + $b;
6}
7echo addNumbers(1.2, 5.2);
8  
9?>