Pagination

Pagination Types

Quick Start

Paginators are the recommended way to handle pagination. They provide a unified API for request parsing, navigation, and response preparation.

Offset Paginator

use Hector\Pagination\OffsetPagination;
use Hector\Pagination\Paginator\OffsetPaginator;

// 1. Create paginator (injectable as service)
$paginator = new OffsetPaginator(
    pageParam: 'page',
    perPageParam: 'per_page',
    defaultPerPage: 15,
    maxPerPage: 100,
);

// 2. Parse request: ?page=3&per_page=20
$request = $paginator->createRequest($serverRequest);

// 3. Query your data
$results = $repository->findAll($request->getLimit(), $request->getOffset());

// 4. Build pagination
$pagination = new OffsetPagination(
    items: $results,
    perPage: $request->perPage,
    currentPage: $request->page,
    hasMore: count($results) >= $request->perPage,
);

// 5. Prepare response with Link headers
$response = $paginator->prepareResponse($response, $serverRequest->getUri(), $pagination);
// Adds: Link: <...?page=1>; rel="first", <...?page=2>; rel="prev", <...?page=4>; rel="next"

Cursor Paginator

use Hector\Pagination\CursorPagination;
use Hector\Pagination\Encoder\Base64CursorEncoder;
use Hector\Pagination\Encoder\SignedCursorEncoder;
use Hector\Pagination\Paginator\CursorPaginator;

// 1. Create paginator with signed encoder
$paginator = new CursorPaginator(
    cursorParam: 'cursor',
    perPageParam: 'per_page',
    defaultPerPage: 15,
    maxPerPage: 100,
    encoder: new SignedCursorEncoder(
        inner: new Base64CursorEncoder(),
        secret: 'your-secret-key',
    ),
);

// 2. Parse request: ?cursor=eyJpZCI6NDJ9.signature&per_page=20
$request = $paginator->createRequest($serverRequest);
$position = $request->getPosition(); // ['id' => 42] or null (already decoded)

// 3. Query your data
$results = $repository->findAfter($position, $request->getLimit() + 1);
$hasMore = count($results) > $request->perPage;
$items = array_slice($results, 0, $request->perPage);

// 4. Build pagination
$pagination = new CursorPagination(
    items: $items,
    perPage: $request->perPage,
    nextPosition: $hasMore ? ['id' => end($items)->id] : null,
    previousPosition: $position,
);

// 5. Prepare response
$response = $paginator->prepareResponse($response, $serverRequest->getUri(), $pagination);

Range Paginator

use Hector\Pagination\Paginator\RangePaginator;
use Hector\Pagination\RangePagination;

// 1. Create paginator
$paginator = new RangePaginator(
    rangeParam: 'range',
    rangeUnit: 'items',
    defaultLimit: 20,
    maxLimit: 100,
);

// 2. Parse request: ?range=20-39 or header Range: items=20-39
$request = $paginator->createRequest($serverRequest);

// 3. Query your data
$results = $repository->findAll($request->getLimit(), $request->getOffset());
$total = $repository->count();

// 4. Build pagination
$pagination = new RangePagination(
    items: $results,
    start: $request->start,
    end: $request->end,
    total: $total,
);

// 5. Prepare response (includes Content-Range, Accept-Ranges, status 206)
$response = $paginator->prepareResponse($response, $serverRequest->getUri(), $pagination);
// Adds: Content-Range: items 20-39/1000
// Adds: Accept-Ranges: items
// Sets: HTTP 206 Partial Content

Navigators

Navigators generate pagination requests and URIs for navigation links.

Using with Paginators

$navigator = $paginator->createNavigator($pagination);

// Get request objects
$firstRequest = $navigator->getFirstRequest();
$prevRequest = $navigator->getPreviousRequest();
$nextRequest = $navigator->getNextRequest();
$lastRequest = $navigator->getLastRequest();

// Get URIs directly
$baseUri = $serverRequest->getUri();
$firstUri = $navigator->getFirstUri($baseUri);  // https://example.com/api?page=1&per_page=20
$prevUri = $navigator->getPreviousUri($baseUri);
$nextUri = $navigator->getNextUri($baseUri);
$lastUri = $navigator->getLastUri($baseUri);

Standalone Usage

use Hector\Pagination\Navigator\OffsetPaginationNavigator;
use Hector\Pagination\UriBuilder\OffsetPaginationUriBuilder;

$uriBuilder = new OffsetPaginationUriBuilder(
    pageParam: 'p',
    perPageParam: 'limit',
);

$navigator = new OffsetPaginationNavigator($pagination, $uriBuilder);

$nextUri = $navigator->getNextUri($baseUri);
// https://example.com/api?p=4&limit=20

Generic Navigator

Auto-detects pagination type:

use Hector\Pagination\Navigator\PaginationNavigator;

$navigator = new PaginationNavigator($pagination);
// Works with OffsetPagination, CursorPagination, or RangePagination

URI Builders

URI builders handle query parameter generation for each pagination strategy.

use Hector\Pagination\UriBuilder\OffsetPaginationUriBuilder;
use Hector\Pagination\UriBuilder\CursorPaginationUriBuilder;
use Hector\Pagination\UriBuilder\RangePaginationUriBuilder;

// Offset
$builder = new OffsetPaginationUriBuilder('page', 'per_page');
$uri = $builder->buildUri($baseUri, $offsetRequest);
// ?page=3&per_page=20

// Cursor
$builder = new CursorPaginationUriBuilder('cursor', 'per_page');
$uri = $builder->buildUri($baseUri, $cursorRequest);
// ?cursor=eyJpZCI6NDJ9&per_page=20

// Range
$builder = new RangePaginationUriBuilder('range');
$uri = $builder->buildUri($baseUri, $rangeRequest);
// ?range=20-39

Pagination Classes

Offset Pagination

Page-based pagination with optional total count.

use Hector\Pagination\OffsetPagination;

// Without total (simple)
$pagination = new OffsetPagination(
    items: $results,
    perPage: 20,
    currentPage: 3,
    hasMore: true,
);

// With total (full navigation support)
$pagination = new OffsetPagination(
    items: $results,
    perPage: 20,
    currentPage: 3,
    total: 500, // or fn() => $repository->count() for lazy loading
);

$pagination->getCurrentPage(); // 3
$pagination->getOffset();      // 40
$pagination->hasMore();        // true (calculated from total)
$pagination->hasPrevious();    // true
$pagination->getTotal();       // 500 or null
$pagination->getTotalPages();  // 25 or null
$pagination->getFirstItem();   // 41 or null
$pagination->getLastItem();    // 60 or null

Supports lazy total count with a Closure:

$pagination = new OffsetPagination(
    items: $results,
    perPage: 20,
    currentPage: 3,
    total: fn() => $repository->count(), // Called only when needed
);

Cursor Pagination

Keyset pagination for efficient navigation through large datasets, with optional total count.

use Hector\Pagination\CursorPagination;

$pagination = new CursorPagination(
    items: $results,
    perPage: 20,
    nextPosition: ['id' => 42, 'created_at' => '2024-01-15'],
    previousPosition: ['id' => 22, 'created_at' => '2024-01-10'],
    cursorName: 'my-cursor', // Optional, for server-side stored cursors
    total: 1000, // Optional
);

$pagination->hasMore();            // true
$pagination->hasPrevious();        // true
$pagination->getNextPosition();    // ['id' => 42, 'created_at' => '2024-01-15']
$pagination->getPreviousPosition(); // ['id' => 22, 'created_at' => '2024-01-10']
$pagination->getCursorName();      // 'my-cursor' or null
$pagination->getTotal();           // 1000 or null

To encode positions as URL-safe cursor strings, use a CursorEncoderInterface:

use Hector\Pagination\Encoder\Base64CursorEncoder;

$encoder = new Base64CursorEncoder();
$nextCursor = $encoder->encode($pagination->getNextPosition());
// "eyJpZCI6NDIsImNyZWF0ZWRfYXQiOiIyMDI0LTAxLTE1In0"

Range Pagination

RFC 7233 style pagination using Content-Range headers.

use Hector\Pagination\RangePagination;

$pagination = new RangePagination(
    items: $results,
    start: 0,
    end: 19,
    total: 1000,
);

$pagination->getStart();        // 0
$pagination->getEnd();          // 19
$pagination->getTotal();        // 1000
$pagination->getContentRange(); // "items 0-19/1000"
$pagination->hasMore();         // true
$pagination->hasPrevious();     // false

Cursor Encoders

Cursors are encoded for safe URL transmission.

Base64 Encoder (default)

use Hector\Pagination\Encoder\Base64CursorEncoder;

$encoder = new Base64CursorEncoder();

$cursor = $encoder->encode(['id' => 42]);
$position = $encoder->decode($cursor);

Signed Encoder

HMAC-signed cursors to prevent tampering. Uses the decorator pattern wrapping any encoder.

use Hector\Pagination\Encoder\Base64CursorEncoder;
use Hector\Pagination\Encoder\SignedCursorEncoder;

$encoder = new SignedCursorEncoder(
    inner: new Base64CursorEncoder(),
    secret: 'your-secret-key',
    algo: 'sha256', // Optional, default is sha256
);

$cursor = $encoder->encode(['id' => 42]);
$position = $encoder->decode($cursor); // Throws InvalidArgumentException if tampered

Use with CursorPaginator for automatic encoding/decoding:

$paginator = new CursorPaginator(
    encoder: $encoder,
    // ...
);

Encrypted Encoder

Fully encrypted cursors using libsodium (sodium_crypto_secretbox). Provides confidentiality and integrity — cursor contents are hidden from clients.

⚠️ Requires the sodium PHP extension.

use Hector\Pagination\Encoder\EncryptedCursorEncoder;

// Generate a secure key (store it safely!)
$key = EncryptedCursorEncoder::generateKey();

$encoder = new EncryptedCursorEncoder($key);

$cursor = $encoder->encode(['id' => 42, 'tenant' => 'acme']);
// "nonce+ciphertext" in URL-safe base64

$position = $encoder->decode($cursor);
// ['id' => 42, 'tenant' => 'acme']

Key requirements:

• Must be exactly 32 bytes (SODIUM_CRYPTO_SECRETBOX_KEYBYTES)
• Use EncryptedCursorEncoder::generateKey() to generate a valid key
• Store the key securely (environment variable, secrets manager)

Use cases:

• Hide internal IDs or sensitive data in cursors
• Prevent cursor inspection by clients
• Stronger security than signed-only cursors

Cursor Storage

Store cursors server-side for short URLs and complex state.

Cache Storage (PSR-16)

use Hector\Pagination\Storage\CacheCursorStorage;

$storage = new CacheCursorStorage(
    cache: $psr16Cache,
    defaultTtl: 3600, // 1 hour
);

// Store cursor state
$name = $storage->store(['id' => 42, 'filters' => ['status' => 'active']]);
// Returns: "a1b2c3d4e5f6..."

// Retrieve cursor state
$state = $storage->retrieve($name);
// Returns: ['id' => 42, 'filters' => ['status' => 'active']]

// Delete cursor
$storage->delete($name);

Array Storage (testing)

use Hector\Pagination\Storage\ArrayCursorStorage;

$storage = new ArrayCursorStorage();

$name = $storage->store(['id' => 42]);
$state = $storage->retrieve($name);

$storage->clear(); // Clear all stored cursors
$storage->count(); // Get count of stored cursors

Pagination Requests

Request objects encapsulate pagination parameters from HTTP requests (PSR-7).

OffsetPaginationRequest

use Hector\Pagination\Request\OffsetPaginationRequest;

// From PSR-7 request: ?page=3&per_page=20
$request = OffsetPaginationRequest::fromRequest(
    request: $serverRequest,
    pageParam: 'page',
    perPageParam: 'per_page',
    defaultPerPage: 15,
    maxPerPage: 100,
);

$request->page;       // 3
$request->perPage;    // 20
$request->getOffset(); // 40
$request->getLimit();  // 20

CursorPaginationRequest

use Hector\Pagination\Request\CursorPaginationRequest;
use Hector\Pagination\Encoder\Base64CursorEncoder;

// From PSR-7 request: ?cursor=eyJpZCI6NDJ9&per_page=20
$request = CursorPaginationRequest::fromRequest(
    request: $serverRequest,
    cursorParam: 'cursor',
    perPageParam: 'per_page',
    defaultPerPage: 15,
    maxPerPage: 100,
    encoder: new Base64CursorEncoder(), // Optional, defaults to Base64
);

$request->perPage;       // 20
$request->getPosition(); // ['id' => 42] or null (already decoded)
$request->getLimit();    // 20

// Or create directly with decoded position
$request = new CursorPaginationRequest(
    perPage: 20,
    position: ['id' => 42],
);

// Or from encoded cursor string
$request = CursorPaginationRequest::fromCursor(
    cursor: 'eyJpZCI6NDJ9',
    perPage: 20,
    encoder: $encoder,
);

Backward navigation (previous page)

Cursor pagination supports navigating to previous pages. The CursorPaginationNavigator handles this automatically by encoding the direction in the cursor:

use Hector\Pagination\Navigator\CursorPaginationNavigator;

$navigator = new CursorPaginationNavigator($pagination);

$nextRequest = $navigator->getNextRequest();     // Forward navigation
$prevRequest = $navigator->getPreviousRequest(); // Backward navigation (direction encoded)

$prevRequest->isBackward(); // true

When using CursorPaginationUriBuilder, the direction is transparently encoded in the cursor token. No additional query parameters are needed:

$prevUri = $navigator->getPreviousUri($baseUri);
// ?cursor=eyJpZCI6NiwiX19kaXJlY3Rpb24iOiJiYWNrd2FyZCJ9&per_page=20
// The direction is embedded in the cursor — the URL stays clean.

The paginator (both QueryCursorPaginator and BuilderCursorPaginator) automatically detects backward requests, reverses the query direction, and returns results in the correct order.

RangePaginationRequest

use Hector\Pagination\Request\RangePaginationRequest;

// From query string: ?range=0-19 or ?offset=0&limit=20
$request = RangePaginationRequest::fromRequest(
    request: $serverRequest,
    offsetParam: 'offset',
    limitParam: 'limit',
    rangeParam: 'range',
    defaultLimit: 20,
    maxLimit: 100,
);

// Or from Range header (RFC 7233): Range: items=0-19
$request = RangePaginationRequest::fromHeader(
    request: $serverRequest,
    unit: 'items',
    defaultEnd: 19,
    maxRange: 100,
);

$request->start;      // 0
$request->end;        // 19
$request->getOffset(); // 0
$request->getLimit();  // 20

JSON Serialization

All pagination classes implement JsonSerializable.

OffsetPagination

{
    "data": ["..."],
    "per_page": 20,
    "current_page": 3,
    "has_more": true,
    "total": 500,
    "total_pages": 25,
    "first_item": 41,
    "last_item": 60
}

CursorPagination

{
    "data": ["..."],
    "per_page": 20,
    "has_more": true,
    "next_position": {"id": 42, "created_at": "2024-01-15"},
    "previous_position": {"id": 22, "created_at": "2024-01-10"},
    "cursor_name": "my-cursor",
    "total": 1000
}

RangePagination

{
    "data": ["..."],
    "start": 0,
    "end": 19,
    "per_page": 20,
    "total": 1000,
    "has_more": true
}

Iteration

All pagination classes are iterable and countable.

foreach ($pagination as $item) {
    // Process item
}

// Or use count
$count = count($pagination); // Items on current page

Exceptions

Pagination classes validate constructor arguments and throw InvalidArgumentException: