Parse / decode multidimensional json array with php

How to parse multidimensional json array with php

<?php

$url = file_get_contents("http://example.com/file.json");

$results = json_decode($url, $depth = 1);   /*depth value could be the level you want to reach */

print_r($results); /* this if you want to check the results */

foreach($results['voice_level_01'] as $result)

	{	 	 

		/* $result of second level voice */

		echo $results['voice_level_02'].'<br/>';

	}
	 	
?>