How do i get json data to php-ThrowExceptions

i need to get ‘name’ ‘avl_bikes’ and ‘coordinates’ to show up to my php from this website http://data.foli.fi/citybike/smoove. My code currently looks like this

<?php
@ini_set("display_errors", 1);
@ini_set("error_reporting", E_ALL);

$string = file_get_contents("http://data.foli.fi/citybike/smoove");
$json_a = json_decode($string, true);


$aika = $json_a["name"]["avl_bikes"];

echo $aika;


?>

Thank you

$string = file_get_contents("http://data.foli.fi/citybike/smoove");
$json_a = json_decode($string, true);

foreach($json_a['result'] as $key => $res){

    echo "avl_bikes = ".$res['avl_bikes']."<br>";
    echo "Name = ".$res['name']."<br>";
    echo "Coordinates = ".$res['coordinates']."<br>";
}