Fatal error: Call to undefined function in file.php error / defined function

Question

I have a site which is developed in 2007. I have been using this website with no problem, but recently I am having a php error like below:

Fatal error: Call to undefined function getTitle() in comments.php error on line 3

$ptitle = htmlspecialchars(getTitle($row_cs['id'])); // line 3

This function is defined in funcs.php file.

Below is how I used the files with include;

index.php

include 'funcs.php'
...
...
...
include 'comments.php'

funcs.php

function getTitle($tid)
{
    $sql = mysql_query("select title from table where id = '".$tid."'");
    $title = mysql_fetch_row($sql);

    return $title[0];
}

I am calling getTitle() method in comments.php.
I am not directly including funcs.php in comments.php
Both files (funcs.php and comments.php) are included in index.php. And I was normally using a funcs.php method in comments.php file.

Why am I getting this error recently, is this a server configuration issue?

Thanks for your helps.

Answer 1

Please use single quote to include the files.

include 'func.php';
include 'comments.php';