Working with the filter_var_array() function

The filter_var_array() function is extremely efficient when we want to verify an entire data set (e.g., a row from a database) at once. Instead of repeating filter_var() for each field individually, we define an array of filters and process everything in a single step.

EXAMPLE

<?php
// Input array (e.g., data retrieved from a database or other source)
$data = [
    'email' => 'example@demo.com',
    'age' => '52',
    'url' => 'https://vadnica.org/'
];

// Defining filters for individual variables in the array
$filters = [
    'email' => FILTER_VALIDATE_EMAIL,
    'age'   => [
        'filter'  => FILTER_VALIDATE_INT,
        'options' => [
            'min_range' => 1,
            'max_range' => 120
        ]
    ],
    'url'   => FILTER_VALIDATE_URL
];

// Bulk data validation
$filtered_data = filter_var_array($data, $filters);

if ($filtered_data) {
    echo "Validation results:\n";
    
    // Email validation
    if ($filtered_data['email'] === false) {
        echo "- Email address is not valid.\n";
    } else {
        echo "- Email address is valid: " . htmlspecialchars($filtered_data['email']) . "\n";
    }

    // Age validation
    if ($filtered_data['age'] === false) {
        echo "- Age is not valid (must be between 1 and 120).\n";
    } else {
        echo "- Age is valid: " . htmlspecialchars($filtered_data['age']) . "\n";
    }

    // URL validation
    if ($filtered_data['url'] === false) {
        echo "- URL address is not valid.\n";
    } else {
        echo "- URL address is valid: " . htmlspecialchars($filtered_data['url']) . "\n";
    }
} else {
    echo "System error during data filtering.";
}
?>

RESULT

The result will be shown here...