Filter: Add examples for `filter_var_array()` and `filter_input_array()`

[Girgias]

These functions are very confusing and needs a bunch of examples.

[OSTARA711]

filter_var_array() function is used to filter multiple variables at once, by validating and sanitizing user input, particularly when you need to handle an array of data.

Sintax

filter_var_array(array $data, array $filters): array|false

Example

$data = [
'email' => 'user@example.com',
'url' => 'http://example.com',
'age' => '25'
];

$filters = [
'email' => FILTER_VALIDATE_EMAIL,
'url' => FILTER_VALIDATE_URL,
'age' => FILTER_VALIDATE_INT
];

$filtered_data = filter_var_array($data, $filters);

print_r($filtered_data);

Conclusion

In the above example, filter_var_array() validates the email, URL and age fields according to the specified filters. Returns an array of filtered values or false if validation fails.

[OSTARA711]

filter_input_array() function is similar but it is typically used for filtering input data coming from external sources like $_GET $_POST or $_REQUEST

Sintax

filter_input_array(int $type, array $filters, bool $add_empty = true): array|false

Example

// Example of using filter_input_array() to filter GET input
$filters = [
'email' => FILTER_VALIDATE_EMAIL,
'age' => FILTER_VALIDATE_INT
];

// Filter input from the GET request
$filtered_input = filter_input_array(INPUT_GET, $filters);

print_r($filtered_input);

Conclusion

Above code filters the email and age values from the $_GET array. It validates the email as an email address and the age as an integer.