John Davidson

Message:

The code from the official example:

<?php

$a = 1;

$b = 2;



function Sum()

{

    global $a, $b;



    $b = $a + $b;

} 



Sum();

echo $b;

?>

Result: 2

If $a and $b are declared global outside the function then it works.

<?php

global $a, $b; // ← added this

$a = 1;

$b = 2;



function Sum()

{

    global $a, $b;



    $b = $a + $b;

} 



Sum();

echo $b;

?>

Result: 3

PHP 5.6.4

Why so?

UPDATE: Thanks for the comments. Apparently, the problem is in the CMS. I will look for the reason in it.

---

My Answer:
A PHP function is a block of code that performs a specific task and can be reused throughout a PHP script. Functions in PHP are defined using the `function` keyword followed by the function name and any parameters that the function may accept. Here is an example of a simple PHP function that adds two numbers together:

php
function addNumbers($num1, $num2) {
$sum = $num1 + $num2;
return $sum;
}

$result = addNumbers(5, 10);
echo $result; // Output: 15


In this example, the `addNumbers` function takes two parameters `$num1` and `$num2`, adds them together, and returns the result. The function is then called with the values `5` and `10`, and the result is stored in the variable `$result` and printed to the screen.