What are the potential pitfalls of not properly checking database query results in PHP?

Not properly checking database query results in PHP can lead to errors or unexpected behavior in your application. It is important to verify that the query was successful and handle any potential errors or empty results appropriately. This can be done by checking the return value of the query function and handling it accordingly.

// Perform a database query
$query = "SELECT * FROM users WHERE id = 1";
$result = mysqli_query($connection, $query);

// Check if the query was successful
if($result){
    // Process the query results
    while($row = mysqli_fetch_assoc($result)){
        // Handle the data
    }
} else {
    // Handle the query error
    echo "Error: " . mysqli_error($connection);
}