What potential issues can arise when using PHP to filter and display data based on user input such as month selection?

One potential issue when using PHP to filter and display data based on user input such as month selection is the risk of SQL injection if the user input is not properly sanitized. To solve this issue, you should always use prepared statements or parameterized queries to prevent SQL injection attacks. 

// Assuming $month is the user input for month selection
$month = $_POST['month'];

// Using prepared statements to prevent SQL injection
$stmt = $pdo->prepare("SELECT * FROM table WHERE MONTH(date_column) = :month");
$stmt->bindParam(':month', $month, PDO::PARAM_INT);
$stmt->execute();

// Fetching and displaying the data
while ($row = $stmt->fetch()) {
    echo $row['column_name'] . "<br>";
}

Keywords

SQL injection cross-site scripting validation sanitization date formatting

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