What best practices should be followed in PHP to ensure proper handling of special characters in input data from different sources like mobile devices?

Special characters in input data from different sources like mobile devices can pose security risks if not handled properly. To ensure proper handling of special characters, it is important to sanitize and validate input data before processing it in your PHP application. One way to do this is by using PHP's `filter_input()` function with the `FILTER_SANITIZE_STRING` filter to remove any potentially harmful characters. 

$input = filter_input(INPUT_POST, 'input_data', FILTER_SANITIZE_STRING);
if ($input === false) {
    // Handle invalid input data
} else {
    // Process sanitized input data
}

Keywords

input validation htmlspecialchars htmlentities filter_input sanitization

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