How to extract json_decode array element value from cURL - php

Question

What I am trying to do is to get the value of the first element, [0]['uri'] from my result curl api. I have an associative array from the curl_exec but can't figure out how to extract the data to find the value of the first element. I have tried echo $alerts[0]['uri'] but it doesn't work.
<?php
// Initiate curl
$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl,CURLOPT_HTTPHEADER,array('Content-Type: application/json',"Authorization: Bearer $access_token"));
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
$result = curl_exec($curl);
curl_close($curl);
$alerts = json_decode($result,true);
print_r($alerts);
//echo $alerts[0]['uri'] doesn't work.
?>
Output Result:
Array (
[result] => success
[message] => Array (
[alerts] => Array (
[0] => Array (
[id] => 78591963
[uri] => htps://access.rrr.com/interface/open_api/api/alerts/78591963
)
[1] => Array (
[id] => 78576283
[uri] => htps://access.rrr.com/interface/open_api/api/alerts/78576283
)
[2] => Array (
[id] => 78576209
[uri] => htps://access.rrr.com/interface/open_api/api/alerts/78576209
)
[3] => Array (
[id] => 78572644
[uri] => htps://access.rrr.com/interface/open_api/api/alerts/78572644
)
[4] => Array
)
)
)
)

Answer 1

Answer was given by other gentlemen in the comment.
I failed to look at the array structure. It is simply:
$alerts['message']['alerts'][0]['uri']