Thread: Cannot Redeclare Function() (previously declared in......) in ....... on line 15

Fatal error: Cannot redeclare loggedin() (previously declared in C:\xampp\htdocs\php\login\core.php:10) in C:\xampp\htdocs\php\login\core.php on line 15

This error always comes up! Please help!! This is my index page. I Already made a function in 'core.php' and the functions name is 'loggedin'.

PHP Code:

<?phperror_reporting (E_ALL ^ E_NOTICE) ;require 'config.php' ;require 'core.php' ;echo '<h1>Index</h1>' ;
if (loggedin()) {$firstname = getuserfield ('firstname') ;$surname = getuserfield ('surname') ;    echo '<u>Homepage</u><br><br>You are logged in as ' .$firstname.' '.$surname.'!<br><br><a href="profile.php">Go To Your Profile!</a><br><br><br><a href="logged_out.php">Logout</a>' ;} else {include 'loginform.php' ;}
?>

Apparently you have declared a function called "loggedin" twice. You can't have two functions with the same name (in the same namespace).

I didn't us it twice!
I made a file called 'core.php' where all the functions are there.
and I included the file (core.php) in the index page and used the function.

Double-check you're only including core.php once then. Perhaps include_once() or require_once() might solve the issue.

I Tried! But didn't work!

Rather than us trying to guess what the problem is, why don't you post the contents of core.php and also the php from your index file.

This is my core.php

PHP Code:

<?php
ob_start();
session_start();
$current_file = $_SERVER['SCRIPT_NAME'];
function loggedin() {
    if (isset($_SESSION['user_id']) && !empty($_SESSION['user_id'])) {
        return true;
    } else {
        return false;
    }
}
function getuserfield($field) {
    $query = "SELECT `$field` FROM `users` WHERE `id`='".$_SESSION['user_id']."'";
    if ($query_run = mysql_query($query)) {
        if ($query_result = mysql_result($query_run, 0, $field)) {
            return $query_result;
        }
    }
}
?>

This is my index.php

PHP Code:

<?php
require 'core.php';
require 'config.php';
if (loggedin()) {
    $firstname = getuserfield('firstname');
    $surname = getuserfield('surname');
    echo 'You are logged in, '.$firstname.' '.$surname.'!<br><br><a href="logout.php">Logout</a>';
} else {
    include 'loginform.php';
}
?>

Is core.php being called in any of the other files or loggedin() being defined in any other file (config.php, logout.php, loginform.php)?

Is this all custom code or are you extending a framework or cms that might also have a similar function?

A quick google search suggested wrapping the following around your loggedin() function:

PHP Code:

if(!function_exists('loggedin')) {

} 


I can't think of anything else at this time - Janvt is the php guru around here, he might be able to suggest something else.

Its used in 'loginform.php'.
Its all custom codes.

Thanks! I'll try that.