JSON解码得到最后一个元素，PHP结束

Question

I want to get the last element in the JSON decoded array, Error I am getting

Warning: end() expects parameter 1 to be array

$data output

stdClass Object ( 
    [contact001] => stdClass Object ( [age] => 33 [name] => Robert [tel] => 87778787878787878 ) 
    [contact002] => stdClass Object ( [age] => 33 [name] => Calvin [tel] => 87778787878787878 ) 
)

PHP code:

$namejson = $firebase->get(DEFAULT_PATH . '/name/');

$data=json_decode($namejson);

foreach ($data as $key => $value) {
    echo end($key);
}

Warning: end() expects parameter 1 to be array

Answer 1

When you decode your $namejson json string to array, you can use array_keys to get array of keys, that are present in your array. Next, you need the last key from this array, use array_pop for this. And because the last key is a string, you can use simple ++ operator to increment the value:

$data = json_decode($namejson, true);
$keys = array_keys($data);
$last_key = array_pop($keys);
echo 'Last key: ' . $last_key;
$last_key++;
$next_key = $last_key;
echo 'Next key: ' . $next_key;