ConfigDumperTrait.php

<?php
/**
 * @link      http://github.com/zendframework/zend-servicemanager for the canonical source repository
 * @copyright Copyright (c) 2016 Zend Technologies USA Inc. (http://www.zend.com)
 * @license   http://framework.zend.com/license/new-bsd New BSD License
 */

namespace Zend\ServiceManager\Tool;

use Traversable;

trait ConfigDumperTrait
{
    private $configTemplate = <<<EOC
<?php
/**
 * This file generated by %s.
 * Generated %s
 */

return %s;
EOC;

    /**
     * @param array $config
     * @return string
     */
    public function dumpConfigFile(array $config)
    {
        $prepared = $this->prepareConfig($config);
        return sprintf(
            $this->configTemplate,
            get_class($this),
            date('Y-m-d H:i:s'),
            $prepared
        );
    }

    /**
     * @param array|Traversable $config
     * @param int $indentLevel
     * @return string
     */
    private function prepareConfig($config, $indentLevel = 1)
    {
        $indent = str_repeat(' ', $indentLevel * 4);
        $entries = [];
        foreach ($config as $key => $value) {
            $key = $this->createConfigKey($key);
            $entries[] = sprintf(
                '%s%s%s,',
                $indent,
                $key ? sprintf('%s => ', $key) : '',
                $this->createConfigValue($value, $indentLevel)
            );
        }

        $outerIndent = str_repeat(' ', ($indentLevel - 1) * 4);

        return sprintf(
            "[\n%s\n%s]",
            implode("\n", $entries),
            $outerIndent
        );
    }

    /**
     * @param string|int|null $key
     * @return null|string
     */
    private function createConfigKey($key)
    {
        if (is_string($key) && class_exists($key)) {
            return sprintf('\\%s::class', $key);
        }

        if (is_int($key)) {
            return null;
        }

        return sprintf("'%s'", $key);
    }

    /**
     * @param mixed $value
     * @param int $indentLevel
     * @return string
     */
    private function createConfigValue($value, $indentLevel)
    {
        if (is_array($value) || $value instanceof Traversable) {
            return $this->prepareConfig($value, $indentLevel + 1);
        }

        if (is_string($value) && class_exists($value)) {
            return sprintf('\\%s::class', $value);
        }

        return var_export($value, true);
    }
}