PHP filter_input() में Filter Flags को AND/OR से Combine करना

PHP के filter_input() में multiple filter flags को combine करने के तरीके।

समस्या

<?php
// यह काम नहीं करता - flags bitwise OR नहीं हैं
$value = filter_input(INPUT_POST, 'field', FILTER_SANITIZE_STRING, 
    FILTER_REQUIRE_ARRAY | FILTER_NULL_ON_FAILURE); // Wrong!

समाधान 1: Array के लिए Conditional Flag

<?php
$value = filter_input(INPUT_POST, 'field', FILTER_DEFAULT, 
    is_array($_POST['field'] ?? null) ? FILTER_REQUIRE_ARRAY : null);

समाधान 2: Custom Filter Function (Flexible)

<?php
function filterInputArray($name, $filter = FILTER_DEFAULT, $flags = 0) {
    $value = filter_input(INPUT_POST, $name, $filter, $flags);
    
    // यदि array है और FILTER_REQUIRE_ARRAY नहीं दिया गया
    if (is_array($value) && !($flags & FILTER_REQUIRE_ARRAY)) {
        // Recursively filter each element
        return array_map(function($v) use ($filter, $flags) {
            return filter_var($v, $filter, $flags);
        }, $value);
    }
    
    return $value;
}

// उपयोग
$emails = filterInputArray('emails', FILTER_VALIDATE_EMAIL);
$names = filterInputArray('names', FILTER_SANITIZE_STRING);

समाधान 3: Loop Through All POST Data

<?php
$filtered = [];

foreach ($_POST as $key => $value) {
    if (is_array($value)) {
        // Array fields: apply array filter
        $filtered[$key] = filter_input(INPUT_POST, $key, FILTER_DEFAULT, 
            FILTER_REQUIRE_ARRAY | FILTER_REQUIRE_SCALAR);
    } else {
        // Scalar fields: apply scalar filter
        $filtered[$key] = filter_input(INPUT_POST, $key, FILTER_SANITIZE_STRING);
    }
}

// Specific field types के लिए
$rules = [
    'email' => [FILTER_VALIDATE_EMAIL],
    'age' => [FILTER_VALIDATE_INT, ['min_range' => 1, 'max_range' => 120]],
    'tags' => [FILTER_DEFAULT, FILTER_REQUIRE_ARRAY],
    'bio' => [FILTER_SANITIZE_STRING],
];

$filtered = [];
foreach ($rules as $field => $rule) {
    $filter = $rule[0];
    $options = $rule[1] ?? [];
    $flags = $rule[2] ?? 0;
    
    $filtered[$field] = filter_input(INPUT_POST, $field, $filter, $flags, $options);
}

समाधान 4: filter_input_array() - Bulk Filtering

<?php
$filters = [
    'name' => FILTER_SANITIZE_STRING,
    'email' => FILTER_VALIDATE_EMAIL,
    'age' => [
        'filter' => FILTER_VALIDATE_INT,
        'options' => ['min_range' => 1, 'max_range' => 150]
    ],
    'tags' => [
        'filter' => FILTER_DEFAULT,
        'flags' => FILTER_REQUIRE_ARRAY
    ],
    'subscribe' => FILTER_VALIDATE_BOOLEAN,
];

$result = filter_input_array(INPUT_POST, $filters);

// Result structure:
// [
//     'name' => 'filtered string',
//     'email' => 'valid@email.com' or false,
//     'age' => 25 or false,
//     'tags' => ['tag1', 'tag2'] or false,
//     'subscribe' => true/false
// ]

Flag Constants Reference

Bitwise Combination (जब applicable हो)

<?php
// ये flags bitwise OR के साथ combine किए जा सकते हैं:
$flags = FILTER_REQUIRE_ARRAY | FILTER_NULL_ON_FAILURE; // = 1 | 8 = 9

$value = filter_input(INPUT_POST, 'tags', FILTER_DEFAULT, $flags);

// लेकिन FILTER_REQUIRE_ARRAY और FILTER_FORCE_ARRAY mutually exclusive हैं