- var_dump: documentation ( source)
- json_encode: documentation ( source)
<?php
$a = [
"newsletter" => [
"capture_source" => "popup",
"gender" => "female",
"email" => "da12@da.com",
"signed_up_date" => "2015-03-10T14:15:19+10:00",
]
];
var_dump(json_encode($a));