php - Retrieving array keys from JSON input

Question

I have this array:

$json = json_decode('
{"entries":[
{"id": "29","name":"John", "age":"36"},
{"id": "30","name":"Jack", "age":"23"}
]}
');

and I am looking for a PHP "for each" loop that would retrieve the key names under entries, i.e.:

id
name
age

How can I do this?

Answer 1

Try it

foreach($json->entries as $row) {
    foreach($row as $key => $val) {
        echo $key . ': ' . $val;
        echo '<br>';
    }
}

In the $key you shall get the key names and in the val you shal get the values