EUDI wallet relying party in PHP?

Yes — the credential-format part. When an EUDI wallet presents a credential, what arrives at your service is an SD-JWT VC (dc+sd-jwt): the issuer-signed token, the claims the holder chose to disclose, and a Key Binding JWT tied to your audience and nonce. k2gl/sd-jwt-vc verifies all of it in pure PHP:

use K2gl\Dsse\PublicKey;
use K2gl\SdJwt\KeyBinding;
use K2gl\SdJwtVc\SdJwtVcVerifier;

$verified = new SdJwtVcVerifier()->verifyPresentation(
    $presentation,
    PublicKey::fromJwk($issuerJwk),
    KeyBinding::required(audience: 'https://you.example', nonce: $nonce, maxAgeSeconds: 300),
);

Issuer keys can be pinned, taken from x5c chains, or discovered via the issuer’s metadata; the vct and protected-claims rules of the SD-JWT VC spec are enforced. Walkthrough: verify an SD-JWT VC presentation.

Scope, honestly

The OpenID4VP transport — request objects, response modes, session management — is your framework’s territory; these packages cover the credential format and its cryptography, which is the part that must be exactly right. Context and specs: digital identity overview.

Poke at the format first

Generate a demo credential, then decode it — both tools run on these packages.