Get the namespace of a class in Laravel

NamespaceHelper.php

<?php

namespace App\Helpers;

class NamespaceHelper
{
    /**
     * Get the namespace of a class.
     *
     * @param  string $className
     * @param  string $searchPath
     * @return string
     */
    public static function getNamespace($className, $searchPath = '/')
    {
        $recursiveDirectoryIterator = new \RecursiveDirectoryIterator(app_path($searchPath));

        $recursiveIteratorIterator = new \RecursiveIteratorIterator($recursiveDirectoryIterator);

        $regexIterator = new \RegexIterator($recursiveIteratorIterator, '/' . $className . '\.php/', \RegexIterator::GET_MATCH);

        $iteratorArray = iterator_to_array($regexIterator);

        $classPath = key($iteratorArray);

        $namespace = str_replace([app_path('\\'), '.php'], null, $classPath);

        return $namespace;
    }
}