config.php

<?php 

return [
    'version' => '1.0.0',
    'table'   => 'table_name',
    'info' => [
        'item' => [
            'name' => 'cherry',
            'value' => 'pick'
          ]
      ]
  ];

dotNotationReader.php

<?php 
function config($name, $default = null, $configFile = 'config.php')
{
    $configFileLocation = __DIR__ . DIRECTORY_SEPARATOR . $configFile;
    if (!file_exists($configFileLocation)) {
        throw new \InvalidArgumentException('Config file does not exist');
    }

    $config = require $configFileLocation;
    
    $pieces = explode('.', $name);
    foreach ($pieces as $piece) {
        if (!is_array($config) || !array_key_exists($piece, $config)) {
            if ($default !== null) {
                return $default;
            } else {
                // error occurred
                throw new \InvalidArgumentException('That config key does not exist.');
            }
        }
        $config = &$config[$piece];
    }

    return $config;
}

// Use
$version = config('version');
$value = config('info.item.value');