第一次使用cUrl和PHP

Question

Hello im trying to get work REST API of one company but they are using POST and GET requests which i have never seen. I was studying whole day and i understand some things. I probably need to use cUrl or html forms but guess cUrl is easier. How can i do this post request by cUrl in php?

curl -v https://testgw.gopay.cz/api/oauth2/token \
-X "POST" \
-H "Accept: application/json" \
-H "Content-Type: application/x-www-form-urlencoded" \
-u "<Client ID>:<Client Secret>" \
-d "grant_type=client_credentials&scope=payment-create"

Im trying this one but it wont send data correctly.

$client_id = "000000:111111";

function httpPost($url)
{

    $ch = curl_init();  

    curl_setopt($ch,CURLOPT_URL,$url);
    curl_setopt($ch,CURLOPT_RETURNTRANSFER,true);
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_HTTPHEADER, array(
    "Content-Type: application/x-www-form-urlencoded",
    "Accept: application/json", 
    "$client_id",
    "grant_type=client_credentials&scope=payment-create"
    )); 

    $output=curl_exec($ch);

    curl_close($ch);
    return $output;

}

echo httpPost("https://testgw.gopay.cz/api/oauth2/token");

Answer 1

$client_id should not be quoted in the array as it is not sending the value of variable it is sending $client_id as a header instead of its value