What is the best practice for storing and retrieving variables in PHP forms, especially when using $_POST?

When storing and retrieving variables in PHP forms, especially when using $_POST, it is best practice to sanitize and validate the input data to prevent security vulnerabilities and ensure data integrity. One common method is to use filter_input() function to retrieve and sanitize input data from $_POST superglobal array. 

// Retrieving and sanitizing input data from $_POST
$username = filter_input(INPUT_POST, 'username', FILTER_SANITIZE_STRING);
$email = filter_input(INPUT_POST, 'email', FILTER_VALIDATE_EMAIL);

// Using the sanitized variables
echo "Username: " . $username . "<br>";
echo "Email: " . $email . "<br>";

Keywords

PHP $_POST variables storing retrieving

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