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PHP code example of provemark / content-credentials

1. Go to this page and download the library: Download provemark/content-credentials library. Choose the download type require.

2. Extract the ZIP file and open the index.php.

3. Add this code to the index.php.

    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

provemark / content-credentials example snippets


use Provemark\ContentCredentials\Core\Manifest\ManifestBuilder;
use Provemark\ContentCredentials\Core\Manifest\MediaType;
use Provemark\ContentCredentials\Core\Signing\Asset;
use Provemark\ContentCredentials\Laravel\ContentCredentials;

$manifest = ManifestBuilder::forAiGenerated(MediaType::Png)
    ->withSoftwareAgent('ACME GenAI Image Model', '3.1.0')
    ->build();

$signed = ContentCredentials::sign(
    new Asset(file_get_contents('image.png'), MediaType::Png),
    $manifest,
);

file_put_contents('signed.png', $signed->bytes);


$report = ContentCredentials::read(new Asset($signed->bytes, MediaType::Png));

$report->isVerifiedAiGenerated();  // true — marked AND the signature checked out
$report->signer()?->issuer;        // "C2PA Test Signing Cert"


use Provemark\ContentCredentials\Core\Manifest\MediaType;
use Provemark\ContentCredentials\Core\Reading\ExtC2paReader;
use Provemark\ContentCredentials\Core\Signing\Asset;

$report = (new ExtC2paReader)->read(
    new Asset(file_get_contents('photo.jpg'), MediaType::Jpeg),
);

$report->hasManifest();       // false when the file carries no credential
$report->isAiGenerated();     // marked as trainedAlgorithmicMedia
$report->isSignatureValid();  // the signature checks out
$report->softwareAgents();    // which system says it made this

bash
pie install ericmann/ext-c2pa      # https://github.com/php/pie