How to use checkbox to delete data from database after submit [closed] - php

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So I am making this website and i got some data in my database. The data is read automatically with php into a table. Every table row also gets automatically a checkbox. Now I want to check the checkbox and then press delete and it deletes the checked data out of the database. Any ideas how?
Here is my code:
<table width="600" border="1" cellpadding="1" cellspacing="1">
<tr>
<th>Username</th>
<th>Paswoord</th>
<th>Delete</th>
</tr>
<?php
while($user = mysql_fetch_assoc($records)){
echo "<tr>";
echo "<td>".$user['UserName']."</td>";
echo "<td>".$user['Pass']."</td>";
echo "<td> <input type='checkbox' name='checkbox' value='checked'</td>";
echo "</tr>";
}
?>
</table>
<form method= "POST" action="deleteuser.php">
<input type="submit" name="delete" value="DELETE USERS">
</form>
this is the code in my delete user.php
$checked = $_POST['checkbox'];
if($_POST['checkbox'] == "checked"){
echo "SUCCEEEEEEES";
}

Answer 1

There are couple of things to be aware of;
The syntax and proper way of writing the <form> tags.
Use the <input> fields inside the <form>.
Pass an array of checkbox[] instead of a single checkbox.
Your Code
<form method= "POST" action="deleteuser.php">
<table width="600" border="1" cellpadding="1" cellspacing="1">
<tr>
<th>Username</th>
<th>Paswoord</th>
<th>Delete</th>
</tr>
<?php
while($user = mysql_fetch_assoc($records)){
echo "<tr>";
echo "<td>".$user['UserName']."</td>";
echo "<td>".$user['Pass']."</td>";
echo "<td> <input type='checkbox' name='checkbox[]' value='checked'</td>";
echo "</tr>";
}
?>
</table>
<input type="submit" name="delete" value="DELETE USERS">
</form>
PHP
Instead of using this;
if($_POST['checkbox'] == "checked"){
echo "SUCCEEEEEEES";
}
?>
Use this;
<?php
foreach($_POST['checkbox'] as $val)
{
echo $val . " this should be deleted";
}
?>

Answer 2

Well this is what I always do :-
Make these changes to your while loop.
<?php
$c=0;
while($user = mysql_fetch_assoc($records)){
$c++
echo "<tr>";
echo "<td>".$user['UserName']."</td>";
echo "<td>".$user['Pass']."</td>";
echo "<td> <input type='checkbox' name='checkbox-$c' value='checked'</td>";
echo "</tr>";
}
echo "<input type='hidden' name='total' value='$c'>";
?>
deleteuser.php (Access all the checkboxes here via a for loop)
<?php
for($i=1;$i<=$_POST['total'];$i++)
{
if($_POST['checkbox-$i'] == "checked")
{
//commands for delete
}
}
?>

Answer 3

Rename the name of the checkbox from checkbox to checkbox[]. Now you get an Array instead a string.
And then set value-attribute to the ID of you row in the table (Primary Key or whatelse you need to delete them)
echo "<td> <input type='checkbox' name='checkbox[]' value='".$user["UserID"]."'</td>";
Now you can iterate them in PHP
foreach ($_POST["checkbox"] as $value){
// ..Delete FROM ... where userID = $value
}