Question

so I have this problem I have 3 files like

2.php

<?php
$variable = 4;
?>

1.php

<?php
class foo {
function bar() {include_once('2.php');}
}
?>

index.php

<?php
include_once('1.php');
$foo = new foo;
foo->bar();
echo $variable;
?>

Why it tells me variable has no value ?
If I do like this

<?php
include_once('1.php');
$foo = new foo;
foo->bar();
include_once('2.php');
echo $variable;
?>

It won’t work either.
Only in this way

<?php
include_once('1.php');
$foo = new foo;
//foo->bar();
include_once('2.php');
echo $variable;
?>

It will work, any explanation?
Thanks

Answer 1

You are confusing include and include_once.

When you use the latter the file loading and thus variable declaration will only occur once. And if you do so within the method scope, it won’t get declared a second time in the global scope. Or vice versa.