Finding nearest unfound caches with OKAPI

nearest_unfound.php

<?php

/* Enter your OKAPI's URL here. */  
$okapi_base_url = "https://opencaching.pl/okapi/";  

/* Enter your Consumer Key here. */
$consumer_key = "YOUR_KEY_HERE";

/* Caches found by this user will be EXCLUDED from the result. */
$username = "USERNAME_HERE";

/* Your location. */
$lat = 54.3;
$lon = 22.3;

/* 1. Get the UUID of the user. */
$json = @file_get_contents(
	$okapi_base_url."services/users/by_username".
	"?username=".$username.
	"&fields=uuid".
	"&consumer_key=".$consumer_key
);
if (!$json)
    die("ERROR! Check your consumer_key and/or username!\n");
$user_uuid = json_decode($json)->uuid;
print "Your UUID: ".$user_uuid."\n";

/* 2. Search for caches. */
$json = @file_get_contents(
	$okapi_base_url."services/caches/search/nearest".
	"?center=".$lat."|".$lon.
	"&not_found_by=".$user_uuid.
	"&limit=5".
	"&consumer_key=".$consumer_key
);
if (!$json)
	die("ERROR!");
$cache_codes = json_decode($json)->results;

/* Display them. */
print "Five nearest unfound caches: ";
print implode(", ", $cache_codes)."\n";