Cannot delete row using check box - php

Question

I'm trying to delete a row from table which is connected to database using checkbox (and it wouldn't matter if its just one row or multiple rows), but it is not working, as in nothing happens. It doesn't delete, no errors or warnings appear just a refresh.
php:
<?php
if(isset($_POST['del_event']))
{
if(isset($_POST['check']) && count($_POST['check']))
{
$array = array("check" => $_POST['check']);
$id = implode(',', $array['check']);
$result = mysql_query("DELETE FROM event WHERE event_id = '$id'") or die(mysql_error());
}
}
?>
html:
<form class="buttons" method="post" action="event.php">
<div class="button-wrap">
<input type="button" id="add_event" name="add_event" value="Add Event"/>
<input type="submit" id="del_event" name="del_event" value="Delete Event"/>
</div>
</form>
<tbody class="tbody-event-list-table2">
<?php
require "connection.php";
$check = mysql_query("SELECT * FROM event") or die(mysql_error());
if(mysql_num_rows($check) > 0)
{
while($row = mysql_fetch_array($check))
{
$id = $row['event_id'];
$name = $row['event_name'];
$start = $row['start'];
$end = $row['end'];
$venue = $row['event_venue'];
echo
"<tr>
<td><input type='checkbox' name='check' id='check' class='check' value='$id'/><a href=''
class='event-link'>$name</a></td><td>$start</td><td>$end</td><td>$venue</td>";
echo "</tr>";
}
}
else
{
echo
"<tr>
<td colspan='4'>There Are No Events.</td>
</tr>";
}
?>
</tbody>
It is if(isset($_POST['del_event'])) because 'del_event' is a name of a delete button which is disabled unless a checkbox is checked.
<script>
var chkbox = $(".check"),
button = $("#del_event");
button.attr("disabled","disabled");
chkbox.change(function(){
if(this.checked){
button.removeAttr("disabled");
}else{
button.attr("disabled","disabled");
}
});
</script>
php version is 5.5.9

Answer 1

This would still give you an undefined error if it is the check variable
if (isset($_POST['check']) && count($_POST['check']) != 0)
but if a checkbox is off in a form it is not sent with the form so it does not exist.
Carpetsmoker was halfway right, a proper solution would be:
if (isset($_POST['check'])) {
if ( (int) $_POST['check'] !== 0) {
}
}
btw, it is better to always cast your variables to a propert type you are checking for.
In PHP 0 can be 0, false or null.
Prevent this by safe type checking with the ===

Answer 2

so i fixed the prob. first i had to remove "form" that was separating the buttons and the table so now "form" is wrapped around both buttons and table. second is the php coding for deletion has changed too.
<form class="buttons" method="post" action="event.php">
<div class="button-wrap">
<input type="button" id="add_event" name="add_event" value="Add Event"/>
<input type="submit" id="del_event" name="del_event" value="Delete Event"/>
<input type="submit" id="edit_event" name="edit_event" value="Edit Event">
</div>
<div class="event-list-table2" >
<table class="event-table">
<thead>
<tr>
<th>Event Name</th>
<th>Start Event</th>
<th>End Event</th>
<th>Venue</th>
</tr>
</thead>
<tbody class="tbody-event-list-table2">
<?php
require "connection.php";
$check = mysql_query("SELECT * FROM event") or die(mysql_error());
if(mysql_num_rows($check) > 0)
{
while($row = mysql_fetch_array($check))
{
$id = $row['event_id'];
$name = $row['event_name'];
$start = $row['start'];
$end = $row['end'];
$venue = $row['event_venue'];
echo
"<tr>
<td><input type='checkbox' name='check[]' class='check' value='$id'><a href='' class='event-link' value='$id' name='event-link'>$name</a></td><td>$start</td><td>$end</td><td>$venue</td>";
echo "</tr>";
}
}
else
{
echo
"<tr>
<td colspan='4'>There Are No Events.</td>
</tr>";
}
?>
</tbody>
<?php
if (isset($_POST['del_event']) && isset($_POST['check']))
{
foreach($_POST['check'] as $del_id)
{
$del_id = (int)$del_id;
$sql = mysql_query("DELETE FROM event WHERE event_id = $del_id") or die(mysql_error());
if($sql)
{
echo "<meta http-equiv=\"refresh\" content=\"0;URL=event.php\">";
}
}
}
?>
</table>
</div>
</form>