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PHP exposes incoming HTTP data through separate superglobals such as $_GET, $_POST, $_FILES, $_COOKIE and $_SERVER. A Request object gives an application a more consistent, object-oriented way to access those sources. Use the request API that fits your framework: Symfony HttpFoundation works on its own or within Symfony, Laravel provides its own Request class, and PSR-7 offers interfaces for interoperability. None of these approaches makes user input trustworthy by itself.
What is a Request object in PHP?
A Request object represents information about an incoming HTTP request, such as its query parameters, submitted form data, uploaded files, cookies, headers and server details. Instead of reaching directly into PHP’s global variables throughout an application, code can use an object API to access the relevant request data.
PHP itself provides separate superglobals for these sources. For example, $_GET contains query-string values, $_POST contains form values handled through PHP’s POST mechanism, $_FILES describes uploaded files, and $_SERVER exposes server and request-environment values. A framework or library can organize access to them, but the underlying sources remain distinct.
Why use a Request object instead of superglobals?
Direct superglobal access can be adequate in a small, framework-free application. A Request object is useful when you want a consistent API, clearer separation between kinds of input, or components that can receive a request explicitly rather than reading global state. An interface-based request can also help middleware and libraries interoperate across frameworks.
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Do not use $_REQUEST as a shortcut for all incoming data without considering its behavior: PHP documents that it combines GET, POST and COOKIE input according to configuration. Its values can be supplied or modified by remote users. Keep sources distinct where that difference matters, and validate and authorize values for the operation you are performing. A wrapper is an access interface, not a security check. PHP Manual: $_REQUEST
Choose the request API that fits your application
| Approach | Use it when | Consideration |
|---|---|---|
| PHP superglobals | The application is small, framework-free, and direct access suits its structure. | Keep query, form, file, cookie and server data distinct; treat values as untrusted. PHP Manual |
Symfony HttpFoundation Request |
You want an object-oriented request API in Symfony or as a standalone component. | Use the appropriate bag for each data source and verify method behavior against the installed version. Symfony HttpFoundation documentation |
Laravel IlluminateHttpRequest |
The application already uses Laravel and its request helpers. | Laravel’s class extends Symfony HttpFoundation’s Request; use the documented bridge route if code needs PSR-7. Laravel request documentation |
PSR-7 ServerRequestInterface |
A library or middleware needs a shared HTTP-message interface, or consumers should depend on an interface rather than a framework class. | PSR-7 defines interfaces, not one concrete request object; an implementation or factory and possibly adapters are still needed. PHP-FIG PSR-7 |
Using Symfony HttpFoundation
HttpFoundation is a standalone Symfony component, so it can be added to a PHP application without adopting the full Symfony framework. The Symfony documentation shows installing it with Composer and creating a request from PHP’s current globals. Symfony HttpFoundation documentation
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composer require symfony/http-foundationAfter Composer’s autoloader is available, create the request at the application’s entry point:
require_once __DIR__ . '/vendor/autoload.php';
use SymfonyComponentHttpFoundationRequest;
$request = Request::createFromGlobals();Symfony groups request data into named bags. The names make the source explicit:
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| Request bag | PHP source or purpose |
|---|---|
query |
Query parameters from $_GET |
request |
Form/request parameters corresponding to $_POST |
files |
Uploaded-file data corresponding to $_FILES |
cookies |
Cookie values corresponding to $_COOKIE |
server |
Server values corresponding to $_SERVER |
headers |
HTTP headers |
attributes |
Application data attached to the request; there is no corresponding PHP superglobal |
For example, read a query parameter from the query bag rather than treating it as form data:
$page = $request->query->get('page');Symfony’s current documentation also describes getPayload() for payload data that may arrive as form input or a JSON string. It provides access to payload data; it does not validate, sanitize or authorize that data. Check the documentation for the version installed in your application before relying on version-specific methods.
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Using Laravel’s Request class
In a Laravel application, the usual choice is IlluminateHttpRequest. Laravel documents it as an object-oriented way to work with the current request, including input, cookies and uploaded files. The class extends SymfonyComponentHttpFoundationRequest, but application code should generally use the Laravel API expected by the application. Laravel request documentation
Laravel also documents a conversion path for code that must consume a PSR-7 request: use the Symfony HTTP Message Bridge and a PSR-7 implementation. That conversion requires the relevant dependencies; PSR-7 support does not mean Laravel’s own Request class is itself the PSR-7 interface. Consult the Laravel documentation that matches your installed version for the current setup details. Laravel request documentation
When PSR-7 is the right fit
PSR-7 is a PHP-FIG standard defining interfaces and semantics for HTTP messages, including server-side requests. A server request can represent server parameters, query parameters, a parsed body, uploaded files, cookies and derived attributes. Depending on an interface can reduce a component’s coupling to one framework or direct access to superglobals. PHP-FIG PSR-7
PSR-7 describes a contract, not a built-in PHP class that you can instantiate on its own. Your application needs an implementation or factory to create request objects, and an adapter may be needed when passing requests between systems with different APIs. PSR-7 message objects follow an immutable pattern: methods that change message properties return an updated instance rather than modifying the original. The body is a stream, however, and the stream’s internal state can change as it is read or written.
Quick Recap
Handle body data, uploads and trust deliberately
- Keep query and body input distinct. A query parameter and a submitted body field may share a name but have different meanings. Read from the source your operation expects.
- Account for body format. Form input and JSON payloads may be exposed differently by an API. Use the framework’s documented parsing facilities for the installed version, and do not assume a convenience accessor performs validation.
- Treat uploaded files as a separate input type. Use the request API’s file representation and follow the framework’s upload-handling guidance rather than treating file metadata as an ordinary string parameter.
- Validate and authorize at the application boundary. Request objects describe incoming data; application rules determine whether that data is well-formed and whether the current user may act on it.
How to decide
- Start with the framework already in use. Use Laravel’s Request API in Laravel, or Symfony HttpFoundation in Symfony, unless an integration requirement calls for another contract.
- Choose the data boundaries you need. If query values, form fields, JSON payloads, uploads and cookies must remain clearly separated, prefer an API that exposes those sources explicitly.
- Check integration requirements. When middleware or reusable libraries need to work across frameworks, determine whether they accept PSR-7 interfaces and what implementation or adapter your stack supplies.
- Check the installed versions. Request helpers and payload behavior are version-dependent; use documentation for the PHP and framework versions actually deployed.
- Pass request data into application code intentionally. Explicitly providing a request or the needed values makes dependencies clearer than having unrelated code reach into global state.
Common mistakes to avoid
- Assuming a Request object makes input safe. It organizes access; it does not establish trust.
- Using a merged input source when precedence matters. Prefer the query, body, cookie or file source that matches the task instead of relying on an ambiguous combined value.
- Assuming PSR-7 is a concrete framework class. It is an interface standard; a compatible implementation is required.
- Expecting immutable messages to freeze a body stream. Message methods return new message instances, while the stream can have mutable read/write position or state.
- Assuming framework APIs are interchangeable. Symfony, Laravel and PSR-7 have different APIs and integration paths; verify behavior against your installed versions.
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