What potential issue did the user encounter with the PHP script?

The potential issue the user encountered with the PHP script is that the variable `$email` is not properly sanitized before being used in the SQL query, leaving the script vulnerable to SQL injection attacks. To solve this issue, the user should use prepared statements with parameterized queries to safely insert user input into the database. 

// Original code with vulnerability
$email = $_POST['email'];
$query = "INSERT INTO users (email) VALUES ('$email')";
$result = mysqli_query($conn, $query);

// Fixed code using prepared statements
$email = $_POST['email'];
$stmt = $conn->prepare("INSERT INTO users (email) VALUES (?)");
$stmt->bind_param("s", $email);
$stmt->execute();
$stmt->close();

Keywords

syntax error undefined variable parse error PHP script debugging

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