eustasy/.normal

<?php

function isJson($filename) {
    $string = file_get_contents($filename);
    json_decode($string);
    return (json_last_error() == JSON_ERROR_NONE);
}

require_once __DIR__.'/function.glob_recursive.php';
$json_files = glob_recursive(__DIR__.'/../*.json');
$result['invalid_files'] = array();
$result['valid_files']   = array();

foreach ( $json_files as $filename ) {
    // Validate
    if ( isJson($filename) ) {
        $result['valid_files'][] = $filename;
    } else {
        $result['invalid_files'][] = $filename;
    }
}

var_dump($result);

if ( !empty($result['invalid_files']) ) {
    // That's an error
    exit(1);
}