In what scenarios would using filter_input() with FILTER_CALLBACK be recommended for processing user input data in PHP scripts?

Using filter_input() with FILTER_CALLBACK is recommended when you need custom validation or sanitization logic for user input data in PHP scripts. This allows you to define a callback function that can perform complex validation or sanitization tasks on the input data before using it in your script, providing an extra layer of security and flexibility. 

// Define a custom callback function for filtering input
function customFilter($value) {
    // Custom validation or sanitization logic goes here
    return $sanitizedValue;
}

// Use filter_input() with FILTER_CALLBACK to process user input data
$inputData = filter_input(INPUT_POST, 'input_field', FILTER_CALLBACK, ['options' => 'customFilter']);

Keywords

filter_input FILTER_CALLBACK user input data processing PHP scripts

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