? PHP filter_var_array()

?️ Quick Overview

The filter_var_array() function in PHP allows you to validate and sanitize multiple variables at once. It is commonly used for processing form data efficiently using predefined rules.

? Key Concepts

• Filters multiple inputs using one function call
• Uses associative arrays for rules
• Supports validation and sanitization

? Syntax / Theory

The function applies filters defined in one array to corresponding values in another array.

// Syntax definition of filter_var_array
filter_var_array(array $data, array $filters, int $flags = 0, int $options = 0);

? Code Example

// Sample form data
$data = [
    'email' => 'test@example.com',
    'url'   => 'https://www.example.com',
    'age'   => '25',
    'name'  => '<h1>John Doe</h1>',
];

// Filters for each input
$filters = [
    'email' => FILTER_VALIDATE_EMAIL,
    'url'   => FILTER_VALIDATE_URL,
    'age'   => FILTER_VALIDATE_INT,
    'name'  => FILTER_SANITIZE_STRING,
];

// Apply filters
$result = filter_var_array($data, $filters);

// Display filtered output
print_r($result);

? Live Output / Explanation

? Interactive Example

Imagine submitting a form with email, URL, age, and name fields. PHP processes them together and instantly validates each input based on predefined rules.

? Use Cases

• Form input validation
• Bulk data sanitization
• API request data checking