Building a URL with JSON data as a query string parameter value - php

Question

I have this data
$data = array('username' => 'myname',
'password' => 'mypass'
);
$json = json_encode($data);
How can i pass the json as a variable to a url that looks like this
'http://example.com/login/?data='
this is what i have tried and get '400: data not passed' error
$data = array('username' => 'myname',
'password' => 'mypass'
);
$data_string = json_encode($data);
$curl = curl_init();
curl_setopt($curl, CURLOPT_POST, TRUE);
curl_setopt($curl, CURLOPT_POSTFIELDS, $data_string);
curl_setopt($curl, CURLOPT_URL, 'http://example.com/login/?data='); //also 'http://example.com/login/'
curl_setopt($curl, CURLOPT_RETURNTRANSFER, TRUE);
curl_setopt($curl, CURLOPT_HTTPHEADER, array(
'Content-Type: application/json',
'Accept: application/json',
'Content-Length: ' . strlen($data_string)
));
curl_setopt($curl, CURLOPT_HEADER, TRUE);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, true);
// Exec
$response = curl_exec($curl);
$info = curl_getinfo($curl);
curl_close($curl);

Answer 1

Any data used in the query string should be URL-encoded.
$url = 'http://example.com/login/' . http_build_query([
'data' => json_encode([
'username' => 'myname',
'password' => 'mypass'
])
]);
http_build_query() will take an associative array of parameters, and apply all the proper encodings, building the whole query string for you.
The URL returned:
http://example.com/login/data=%7B%22username%22%3A%22myname%22%2C%22password%22%3A%22mypass%22%7D

Answer 2

This is possible to do this, you are pretty much there.
$data = array('username' => 'myname',
'password' => 'mypass'
);
$json = json_encode($data);
$url = 'http://example.com/login/?data=' . urlencode($json);
This will be a safe url that can do what ever you want with it.