<?php

 $amg = '{
	    "friendslist": {
	        "friends": [
	            {
	                "steamid": "76561197960265731",
	                "relationship": "friend",
	                "friend_since": 0
	            },
	            {
	                "steamid": "76561197960265738",
	                "relationship": "friend",
	                "friend_since": 0
	            },
	            {
	                "steamid": "76561197960265740",
	                "relationship": "friend",
	                "friend_since": 0
	            },
	            {
	                "steamid": "76561197960265747",
	                "relationship": "friend",
	                "friend_since": 0
	            }
	        ]
	    }
	}';
	
	$decode = json_decode( $amg, TRUE );
	foreach ( $decode["friendslist"]["friends"] as $valor){
		echo 'Id:'.$valor["steamid"].PHP_EOL;
		echo 'Rel.:'.$valor["relationship"].PHP_EOL;
		echo PHP_EOL;
	}