JSON linter

jsonlint.php

<?php
<<<CONFIG
packages:
    - "seld/jsonlint: 1.3.1"
CONFIG;

use Seld\JsonLint\JsonParser;

$parser = new JsonParser();

$json = file_get_contents($argv[1]);

$result = $parser->lint($json);
if (null === $result) {
    return 0;
}

echo $result->getMessage();

return 1;