我正在尝试从sql中删除按钮。我启动了一个名为$ del的函数，但我不知道如何完成该函数，其形式为在当前echo语句旁边echo出一个delete按钮。

$con = mysql_connect("localhost", "user", "pass");
if (!$con) {
    die('Could not connect: ' . mysql_error());
}

mysql_select_db("database", $con);
$sql = "INSERT INTO camps (city, map, park, day, details) 
    VALUES ('$_POST[city]','$_POST[map]','$_POST[park]','$_POST[day]','$_POST[details]')";

if (!mysql_query($sql, $con)) {
    die('Error: ' . mysql_error());
}

$number = 0;
$del = mysql_query("DELETE FROM camps WHERE user_id= '$number'");

$result = mysql_query("SELECT * FROM camps");

while ($row = mysql_fetch_array($result)) {
    echo "<a href=\"'" . $row['map'] . "\">" . $row['city'] . "</a>";
    echo "<br />";
}