How can PHP functions like filter_input be used to improve the security and reliability of form submissions?

When accepting form submissions in PHP, it is important to validate and sanitize user input to prevent security vulnerabilities such as SQL injection and cross-site scripting attacks. The filter_input function in PHP provides a convenient way to validate and sanitize input data from various sources like GET, POST, and COOKIE. Using filter_input with appropriate filter types can help improve the security and reliability of form submissions by ensuring that the input data meets certain criteria before processing it further. 

$username = filter_input(INPUT_POST, 'username', FILTER_SANITIZE_STRING);
$email = filter_input(INPUT_POST, 'email', FILTER_VALIDATE_EMAIL);

if($username && $email) {
    // Process the form submission
} else {
    // Handle validation errors
}

Keywords

PHP functions filter_input security reliability form submissions

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