Question

I have 2 php files.

index.php:

<?php
    $counter = 0;
    require_once('temp.php');
    temp();
    echo $counter;
?>

temp.php:

<?php
    function temp() {
            tempHelper();
    }
    function tempHelper() {
            $counter++;
    }
?>

I want to print 1 not 0.
I tried to set $counter as global variable without success.

What can I do?

Answer 1

Your tempHelper function is incrementing a local $counter variable, not the global one. You have to either pass the variable in by reference through both functions, or use the global variable:

function tempHelper() {
  global $counter;
  $counter++;
}

Note that dependence on global variables likely indicates a design flaw in your application.