how to get the value of multiple checkbox in php - php

Question

I have use the following code to select multiple value for selected checkbox to delete it from database table but when I am print_r its only shows keys for it not showing value for id.
I have use this code to get value in array:-
<?php
echo "Hiiiiiiiiii";
include("conn.php");
$sql="select * from test ";
$res=mysql_query($sql) or die(mysql_error());
?>
<form name="form1" method="POST" action="">
<table width="578" border="1" align="center" id="menu">
<tr>
<th></th>
<th>id</th>
<th>Name</th>
<th>email</th>
<th>phno</th>
</tr>
<?php
while($row=mysql_fetch_array($res))
{
?>
<tr>
<td><input name="checkbox[]" type="checkbox" id="checkbox[]" value="<? echo $rows['id']; ?>"></td>
<td><?php echo $row['id'];?></td>
<td><?php echo $row['name'];?></td>
<td><?php echo $row['emailid'];?></td>
<td><?php echo $row['phno'];?></td>
<?php
echo"<td><a href='update.php?id=".$row['id']."'>Update</a></td>";
?>
<?php
}
?>
<tr><td><input type="submit" name="delete" value="Delete" id="delete"></td></tr></tr></table>
<?php
// Check if delete button active, start this
$count = mysql_num_rows($res);
echo "$count";
if(isset($_POST['delete']))
{
if(count($_POST['checkbox']) !=0)
{
$array = array("checkbox" => $_POST['checkbox']);
print_r($array);
$ids = implode(',', $array);
echo "$ids";
$result = mysql_query("DELETE FROM test WHERE id IN ($ids)") or die(mysql_error());
}
}
// if successful redirect to delete_multiple.php
if($result)
{
echo "<meta http-equiv=\"refresh\" content=\"0;URL=teach_delinquent.php\">";
echo "SUCCESS";
}
?>

Answer 1

$_POST['checkbox'] array will contain only checked boxes:
$ids = array();
foreach($_POST['checkbox'] as $val){
$ids[] = (int) $val;
}
$ids = implode(',', $ids);
I've done the foreach to make all id's INT for security purposes.

Answer 2

Quick fix of your question is as follows
Replace below line
$array = array("checkbox" => $_POST['checkbox']);
with
$array = $_POST['checkbox'];
or
$array = array_map('intval',$_POST['checkbox']); // if all values are integer ---for security
because $_POST['checkbox'] is already an array
Hope this will fix your problem

Answer 3

First of all you need to count how many checkboxes are there
$counter = sizeof($_POST['checkbox']);
The run a loop to access all of these values
for($i=0;$i<=$counter;$i++){
$checkbox_val = $_POST['checkbox'][$i];
}
That's all you need