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User: ubuntu (1000)
PHP: 8.1.2-1ubuntu2.24
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File: //usr/share/doc/php-json-schema/examples/demo.php
<?php

require __DIR__ . '/../vendor/autoload.php';

$data = json_decode(file_get_contents('data.json'));

// Validate
$validator = new JsonSchema\Validator();
$validator->check($data, (object) array('$ref' => 'file://' . realpath('schema.json')));

if ($validator->isValid()) {
    echo "The supplied JSON validates against the schema.\n";
} else {
    echo "JSON does not validate. Violations:\n";
    foreach ($validator->getErrors() as $error) {
        echo sprintf("[%s] %s\n", $error['property'], $error['message']);
    }
}