What are some potential pitfalls when using IS NOT NULL in PHP?

Using IS NOT NULL in PHP can lead to potential pitfalls if not used correctly. One common mistake is forgetting to properly sanitize user input before using IS NOT NULL, which can leave your application vulnerable to SQL injection attacks. To avoid this, always sanitize user input before using IS NOT NULL in SQL queries. 

// Example of properly sanitizing user input before using IS NOT NULL in a SQL query
$userInput = $_POST['input'];
$cleanInput = mysqli_real_escape_string($connection, $userInput);

$sql = "SELECT * FROM table WHERE column IS NOT NULL AND column = '$cleanInput'";
$result = mysqli_query($connection, $sql);

// Rest of the code to handle the query result

Keywords

IS NOT NULL PHP SQL database error handling

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