Update MySQL fields w/ update button - php

Question

I'm attempting to update all of the fields displayed from a MySQL table. The delete feature currently works, but I'm not getting any output whatsoever for the update feature. I feel like I'm missing something very basic. Any input is appreciated!
<form action="" method="post">
<?php
$con = mysqli_connect($host,$username,$password,$dbname);
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
$query = mysqli_query($con,"SELECT * FROM customers");
while($row = mysqli_fetch_array($query))
{
echo "<tr>";
echo "<td><input type=\"text\" name=\"FirstName\" value=\"" . htmlspecialchars($row['FirstName'], ENT_QUOTES, 'UTF-8') . "\"></td>";
echo "<td><input type=\"text\" name=\"LastName\" value=\"" . htmlspecialchars($row['LastName'], ENT_QUOTES, 'UTF-8') . "\"></td>";
echo "<td>" . htmlspecialchars($row['email'], ENT_QUOTES, 'UTF-8') . "</td>";
echo "<td>" . htmlspecialchars($row['address'], ENT_QUOTES, 'UTF-8') . "</td>";
echo "<td>" . htmlspecialchars($row['phone'], ENT_QUOTES, 'UTF-8') . "</td>";
echo "<td>" . htmlspecialchars($row['product'], ENT_QUOTES, 'UTF-8') . "</td>";
echo "<td>" . htmlspecialchars($row['firmware'], ENT_QUOTES, 'UTF-8') . "</td>";
echo "<td>" . htmlspecialchars($row['purchase_date'], ENT_QUOTES, 'UTF-8') . "</td>";
echo '<td align="center"><input type="hidden" name="email" value="';
echo htmlspecialchars($row['email'], ENT_QUOTES, 'UTF-8');
echo '"><input type="submit" name="delete" value="X"> </td>';
echo "</tr>";
echo '<tr><td colspan="9"><input type="hidden" name="email" value="';
echo htmlspecialchars($row['email'], ENT_QUOTES, 'UTF-8');
echo '"><input type="submit" name="edit" value="Update"></td></tr>';
}
echo "</table>";
?>
<?php
if(isset($_POST['delete'])) {
$email = $_POST['email'];
$delete = "DELETE FROM customers WHERE email = '$email'";
if ($con->query($delete) === TRUE) {
echo "Record deleted successfully";
} else {
echo "Error deleting record: " . $con->error;
}
if (isset($_POST['edit'])) {
$email = $_POST['email'];
$FirstName = $_POST['FirstName'];
$LastName = $_POST['LastName'];
$edit = "UPDATE customers SET Firstname = '$FirstName', LastName = '$LastName' WHERE email = '$email'";
if ($con->query($edit) === TRUE) {
echo $edit;
echo "Record updated successfully";
} else {
echo $edit;
echo "Error updating record: " . $con->error;
}
}
$conn->close();
}
?>
</form>

Answer 1

check your spelling on conn
Try this:
<form action="" method="post">
<?php
$conn = mysqli_connect($host,$username,$password,$dbname);
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
// $query = mysqli_query($conn,"SELECT * FROM customers");
$query = $conn->query("SELECT * FROM customers");
while($row = $query->fetch_assoc())
{
echo "<tr>";
echo "<td><input type=\"text\" name=\"FirstName\" value=\"" . htmlspecialchars($row['FirstName'], ENT_QUOTES, 'UTF-8') . "\"></td>";
echo "<td><input type=\"text\" name=\"LastName\" value=\"" . htmlspecialchars($row['LastName'], ENT_QUOTES, 'UTF-8') . "\"></td>";
echo "<td>" . htmlspecialchars($row['email'], ENT_QUOTES, 'UTF-8') . "</td>";
echo "<td>" . htmlspecialchars($row['address'], ENT_QUOTES, 'UTF-8') . "</td>";
echo "<td>" . htmlspecialchars($row['phone'], ENT_QUOTES, 'UTF-8') . "</td>";
echo "<td>" . htmlspecialchars($row['product'], ENT_QUOTES, 'UTF-8') . "</td>";
echo "<td>" . htmlspecialchars($row['firmware'], ENT_QUOTES, 'UTF-8') . "</td>";
echo "<td>" . htmlspecialchars($row['purchase_date'], ENT_QUOTES, 'UTF-8') . "</td>";
echo '<td align="center"><input type="hidden" name="email" value="';
echo htmlspecialchars($row['email'], ENT_QUOTES, 'UTF-8');
echo '"><input type="submit" name="delete" value="X"> </td>';
echo "</tr>";
echo '<tr><td colspan="9"><input type="hidden" name="email" value="';
echo htmlspecialchars($row['email'], ENT_QUOTES, 'UTF-8');
echo '"><input type="submit" name="edit" value="Update"></td></tr>';
}
echo "</table>";
?>
<?php
if(isset($_POST['delete'])) {
$email = $_POST['email'];
$delete = "DELETE FROM customers WHERE email = '$email'";
if ($conn->query($delete) === TRUE) {
echo "Record deleted successfully";
} else {
echo "Error deleting record: " . $conn->error;
}
if (isset($_POST['edit'])) {
$email = $_POST['email'];
$FirstName = $_POST['FirstName'];
$LastName = $_POST['LastName'];
$edit = "UPDATE customers SET Firstname = '$FirstName', LastName = '$LastName' WHERE email = '$email'";
if ($conn->query($edit) === TRUE) {
echo $edit;
echo "Record updated successfully";
} else {
echo $edit;
echo "Error updating record: " . $conn->error;
}
}
$conn->close();
}
?>
</form>