What potential pitfalls should be considered when building a query to search for multiple keywords in a MySQL database using PHP?

When building a query to search for multiple keywords in a MySQL database using PHP, potential pitfalls to consider include SQL injection attacks and inefficient queries due to lack of proper indexing. To prevent SQL injection, it is important to sanitize user input before including it in the query. Additionally, using the LIKE operator in the query can lead to inefficient searches, especially when dealing with large datasets. Indexing the columns being searched can help improve query performance.

// Assuming $keywords is an array of search terms
$keywords = array_map('mysqli_real_escape_string', $keywords);

// Build the query using prepared statements to prevent SQL injection
$query = "SELECT * FROM table_name WHERE column_name LIKE ?";
foreach($keywords as $keyword) {
    $query .= " OR column_name LIKE ?";
}

$stmt = $mysqli->prepare($query);
$params = array_fill(0, count($keywords), "%$keyword%");
$stmt->bind_param(str_repeat('s', count($keywords)), ...$params);
$stmt->execute();
$result = $stmt->get_result();

// Process the results