json - How to send the content of SSL-related files to the API call | PHP | cUrl

I have two files for SSLssl_crt andssl_key. I want to read the content of these files and send it to the APIs as a JSON field. But thefile_get_contents actually convert the single slash to double so the API return the following error.

The private key format is invalid.

The certificate format is invalid.

I am actually using run cloud service where I want to send the content of these files to one of their API

https://runcloud.io/docs/api/web-application#ssl-basic-install-ssl

As you can see in the above URL, they need the content in the proper format.

So I tried the following.

$curl = curl_init();

$ssl_crt = file_get_contents(selectServer()->ssl_crt_path);
$ssl_key = file_get_contents(selectServer()->ssl_key_path);

$data = [
    'provider' => 'custom',
    'enableHttp' => true,
    'enableHsts' => false,
    'certificate' => $ssl_crt,
    'privateKey' => $ssl_key,
];

curl_setopt_array($curl, array(
    CURLOPT_URL => 'https://manage.runcloud.io/api/v2/servers/{id}/webapps/{webapp_id}/ssl',
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_ENCODING => '',
    CURLOPT_MAXREDIRS => 10,
    CURLOPT_TIMEOUT => 0,
    CURLOPT_FOLLOWLOCATION => true,
    CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
    CURLOPT_CUSTOMREQUEST => 'POST',
    CURLOPT_POSTFIELDS => json_encode($data, JSON_UNESCAPED_SLASHES),
    CURLOPT_HTTPHEADER => array(
        'Accept: application/json',
        'Content-Type: application/json',
        'Authorization: Basic {token}'
    ),
));

$response = curl_exec($curl);

curl_close($curl);
echo $response;
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If I manually write the content of the certificate(or key) to the data array then it works fine. i.e

$data = [
    // ...
    'certificate' => '-----BEGIN CERTIFICATE-----\nblah\nblah==\n-----END CERTIFICATE-----,
    'privateKey' => '-----BEGIN PRIVATE KEY-----\nblah\nblah==\n-----END PRIVATE KEY-----,
];
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The actual issue with the format. the "\n" becomes "\n" and the main content of the certificate or key can have "\n".

Can someone help me out with this?

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