Undefined offset 0

<?php 
include("config.php"); 

function getAllVotes($id) 
{ 
    $votes = array(); 
    $q = "SELECT * FROM entries WHERE id = $id"; 
    $r = mysql_query($q); 
    if(mysql_num_rows($r)==1)//id found in the table 
    { 
        $row = mysql_fetch_assoc($r); 
        $votes[0] = $row['votes_up']; 
        $votes[1] = $row['votes_down']; 
    } 
    return $votes; 
} 

function getEffectiveVotes($id) 
{ 
        $votes = getAllVotes($id); 
        $effectiveVote = $votes[0] - $votes[1];    //ERROR THROWN HERE
        return $effectiveVote; 
} 

$id = $_POST['id']; 
$action = $_POST['action']; 

//get the current votes 
$cur_votes = getAllVotes($id); 

//ok, now update the votes 

if($action=='vote_up') //voting up 
{ 

    $votes_up = $cur_votes[0]+1;     //AND ERROR THROWN HERE


    $q = "UPDATE threads SET votes_up = $votes_up WHERE id = $id"; 
} 
elseif($action=='vote_down')
{ 
    $votes_down = $cur_votes[1]+1; 
    $q = "UPDATE threads SET votes_down = $votes_down WHERE id = $id"; 
} 

$r = mysql_query($q); 
if($r)
{ 
    $effectiveVote = getEffectiveVotes($id); 
    echo $effectiveVote." votes"; 
} 
elseif(!$r) //voting failed 
{ 
    echo "Failed!"; 
} 
?>

Source: stackoverflow.com

Similar codes

5 votes119 views2 answers
Route() and with() in laravel
PHP Laravel
1 vote96 views3 answers
Add Product Short Description To Product Category In WooCommerce
PHP
0 vote113 views1 answer
Get records from Sunday to Sunday laravel
PHP Laravel
0 vote103 views2 answers
Php artisan app:name in laravel 6
PHP
0 vote109 views2 answers
Laravel collection every
PHP Laravel
0 vote93 views1 answer
Run xampp application on windows startup
PHP
-1 vote62 views2 answers
Wp websites login
PHP
2 votes91 views1 answer
Check if ajax request php
PHP
0 vote136 views1 answer
If post checked category wordpress
PHP Wordpress
2 votes92 views2 answers
Add seconds to datetime carbon
PHP