Usuwanie wpisów bazy danych za pomocą pól wyboru

Tutaj jest przetestowany i działa podczas korzystania z mysqli_ zamiast mysql_

Zastąp własnymi danymi uwierzytelniającymi.

Kilka rzeczy, twoje pole wyboru wymagało nawiasów kwadratowych wokół nazwanego elementu, jak wspomniałem w moim komentarzu, tj. name='checkbox[]' w przeciwnym razie otrzymasz nieprawidłowe foreach błąd argumentu.

Uwaga na marginesie:trzeba trochę formatować, ale to działa.

<table class="ts">
        <tr>
            <th class="tg-031e" style='width:1px'>ID</th> 
            <th class="tg-031e">IP address</th>
            <th class="tg-031e">Date added</th>
            <th class="tg-031e">Reason</th>
        </tr>

<?php

$DB_HOST = "xxx";
$DB_NAME = "xxx";
$DB_USER = "xxx";
$DB_PASS = "xxx";

$con = new mysqli($DB_HOST, $DB_USER, $DB_PASS, $DB_NAME);
if($con->connect_errno > 0) {
  die('Connection failed [' . $con->connect_error . ']');
}

$SQL = "SELECT `ID`, `IPaddress`, `DateAdded`, `Reason` FROM `banned`";
$exec = mysqli_query($con,$SQL);

echo "<form method='post'>";

        while ($row = mysqli_fetch_array($exec)){
                echo "<tr class='tg-031h'>";
                echo "<td class='tg-031e'><input type='checkbox' name='checkbox[]' value='" . $row[ID] . "'></td>";

                echo "<td class='tg-031e'>" . $row['IPaddress'] . "</td>";
                echo "<td class='tg-031e'>" . $row['DateAdded'] . "</td>";
                echo "<td class='tg-031e'>" . $row['Reason'] . "</td>";
        }

echo "</tr></table>"; 

        echo "<input name='delete' type='submit' value='Delete'></form>";

        if (isset($_POST['delete']) && isset($_POST['checkbox'])) {
            foreach($_POST['checkbox'] as $id){
                $id = (int)$id;

                $delete = "DELETE FROM banned WHERE ID = $id"; 
                mysqli_query($con,$delete);
            }
        }

?>

Używaj mysqli_* z przygotowanymi zestawieniami lub PDO z przygotowanymi oświadczeniami w tym celu.

Edytuj: mysql_ wersja

<table class="ts">
        <tr>
            <th class="tg-031e" style='width:1px'>ID</th> 
            <th class="tg-031e">IP address</th>
            <th class="tg-031e">Date added</th>
            <th class="tg-031e">Reason</th>
        </tr>

<?php

include 'connect.php';

$SQL = "SELECT `ID`, `IPaddress`, `DateAdded`, `Reason` FROM `banned`";
$exec = mysql_query($SQL, $connection);

echo "<form method='post'>";

        while ($row = mysql_fetch_array($exec)){
                echo "<tr class='tg-031h'>";
                echo "<td class='tg-031e'><input type='checkbox' name='checkbox[]' value='" . $row[ID] . "'></td>";

                echo "<td class='tg-031e'>" . $row['IPaddress'] . "</td>";
                echo "<td class='tg-031e'>" . $row['DateAdded'] . "</td>";
                echo "<td class='tg-031e'>" . $row['Reason'] . "</td>";
        }

echo "</tr></table>"; 

        echo "<input name='delete' type='submit' value='Delete'></form>";

        if (isset($_POST['delete']) && isset($_POST['checkbox'])) {
            foreach($_POST['checkbox'] as $id){
                $id = (int)$id;

                $delete = "DELETE FROM banned WHERE ID = $id"; 
                mysql_query($delete);
            }
        }

?>