Why is the error Cannot redeclare Any function() previously declared in home/etc?

Question

PHP

Why is the error Cannot redeclare funuia() previously declared in /home/etc.
Moreover, this error occurs on the last function, for example:

<?php

include 'index.php';

$page = 1;

function getRestsFromPage($page)
{
'some code';
}

function GetMaxPage($page)
{
'some code';
}

function getpdo()
{
'some code';
}

and the error is Cannot redeclare getpdo() previously declared in /home/etc.
But, if I put one more function, absolutely any one, let's say:

<?php

include 'index.php';

$page = 1;

{
'some code';
}

function GetMaxPage($page)
{
'some code';
}

function getpdo()
{
'some code';
}
function syka_yshe_2cahsa_sishy_nad_etoi_hernoi()
{
'some code';
}

Then it gives me:
Cannot redeclare syka_yshe_2cahsa_sishy_nad_etoi_hernoi() previously declared in /home/etc.

Here's the trick, help if you can

Answer 1

Use include_once() .