Question

How to delete multiple data from table with checkbox?
I have this code:

<form id="prefForm" action="coments-del.php" method="post">

<?

$result = mysql_query("SELECT * FROM comments");      
$myrow = mysql_fetch_array($result);

do
{
    $res = mysql_query("SELECT title FROM data WHERE id=$myrow[post]");
    $row = mysql_fetch_array($res);
    printf ("
         <tr>
           <td>
                <input type='checkbox' name='id' value='%s'  />
                </td>        
                <td>%s</td>
           <td>%s</td>
                <td>%s</td>
         ",$myrow["id"],$myrow["id"],$myrow["author"],$myrow["text"]);
}
while ($myrow = mysql_fetch_array($result));
?>

<input name="submit-button" type="submit" value="Delete" />
</form>

Here is the coments-del.php where you get brought after submiting form in script above.

In the head is:

if (isset($_POST['id'])) { $id = $_POST['id']; }

At the body is the code that proccess the deleting.

<?php 
if (isset($id)) {
    $result = mysql_query ("DELETE FROM comments WHERE id='$id'");

    if ($result == 'true') {echo "Comment Deleted!";}
    else {echo "Error: Nothing was deleted!";}

} else {
    echo "Unknown Error! Contact Administrator.";
}

?>

Answer 1

First step is to make your checkbox name an array.

<input type='checkbox' name='id[]' value='%s'  />

And when your script receive the post, parse that array out to the appropriate sql clause.

$clause="";
if (isset($_POST['id'])) { 
   foreach ($_POST['id'] as $p)
   $clause.="id='$p' OR"; 
}
$clause=substr($clause,0,-2);

Finally put the clause into the query in the where clause.