php check undefined offset
// $key = 10, if $array does not have $array[10] set, it will return false
// If $array[10] has any value, it will return true
if(array_key_exists($key, $array)){}php check undefined offset
// $key = 10, if $array does not have $array[10] set, it will return false
// If $array[10] has any value, it will return true
if(array_key_exists($key, $array)){}php undefined offset
If preg_match did not find a match, $matches is an empty array. So you should check if preg_match found an match before accessing $matches[0], for example:
function get_match($regex,$content)
{
if (preg_match($regex,$content,$matches)) {
return $matches[0];
} else {
return null;
}
}undefined offset 0
<?php
include("config.php");
function getAllVotes($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!";
}
?>Copyright © 2021 Codeinu
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