PHP to delete SQL row with multiple checkboxes

Question

I am trying to delete multiple rows with chekboxes. Below is my code

      <?php
$host="localhost"; // Host name 
$username="****"; // Mysql username 
$password="****"; // Mysql password 
$db_name="****"; // Database name 
$tbl_name="****"; // Table name 

// Connect to server and select database.
mysql_connect("$host", "$username", "$password")or die("cannot connect"); 
mysql_select_db("$db_name")or die("cannot select DB");

$result = mysql_query("SELECT * FROM members WHERE dealer='Panzer Protection'");
?>
<form name="form1" method="post" action="">
      <?php
while($rows=mysql_fetch_array($result)){
?>
      <tr>
        <td bgcolor="#666666"><input name="checkbox[]" type="checkbox" id="checkbox[]"    
value="<? echo $rows['member_id']; ?>"></td>
        <td bgcolor="#666666"><? echo $rows['member_id']; ?></td>
        <td bgcolor="#666666"><center>
          <? echo $rows['member_msisdn']; ?></td>
        <td bgcolor="#666666"><center>
          <? echo $rows['member_name']; ?></td>
        <td bgcolor="#666666"><div align="center"><? echo $rows['dealer']; ?></div>   

 </td>
        <td align="center" bgcolor="#FFFFFF"><a href="control_clientinfo.php?member_id=   
<? echo $rows['member_id']; ?>" class="update">Look Up</a></td>
      </tr>
      <?php
}
?>

<tr>
<td colspan="6" align="center" bgcolor="#FFFFFF"><input name="delete" type="submit"     
id="delete" value="Delete"></td>
</tr>

</form> //Forgot form close in past
<?php

// Check if delete button active, start this 
if($_POST['delete']){
for($i=0;$i<$count;$i++){
$i = 0;
while(list($key, $val) = each($_POST['checkbox'])) {
$sql = "DELETE FROM $tbl_name WHERE id='$val'";
mysql_query($sql);
$i += mysql_affected_rows();
}
}
// if successful redirect to 
if($result){
echo "<meta http-equiv="refresh" content="0;URL=control_clientlistdel.php">";

}
}
mysql_close();
?>

It shows me the list i call and i can tick the boxes. If i hit delete button it just refreshes the screen and the one i ticked is still there

Answer 1

First things first. It's bad idea to use mysql as it is really old and it's deprecated.

Second, where do you assign your variables ($delete, $count)

you have to check if the delete key of your POST is set:

if (isset($_POST['delete'])) { // Then the form has been submitted

after this, assign your $count variable

$checkbox = $_POST['checkbox'];
$count = count($checkbox);

And everything must work fine.

Final result

if (isset($_POST['delete'])) {
    $checkbox = $_POST['checkbox'];
    $count = count($checkbox);

    for($i = 0; $i < $count; $i++) {
        $id = (int) $checkbox[$i]; // Parse your value to integer

        if ($id > 0) { // and check if it's bigger then 0
            mysql_query("DELETE FROM table WHERE member_id = $id");
        }
    }
}

Check out the mysqli and the PDO drivers for interacting with the database.