Web API - HTTP Post Request That Includes Header & Body - php

Question

I just got API access for one of the website on the internet, and as a new api developer i got into troubles understanding how should i start and with what, So hope you guys guide me . They don't have Documents or tutorials Yet.
If anyone can give me a small example on how to send Http post request that includes Header and body? As what they are mentioning in the API page:
All requests must include an Authorization header with siteid and
apikey (with a colon in between) and it must match with the siteid and
apikey in the request body
In the body the Parameter content type will be application/json. They have also provided a Base URL.
The response will be as application/json.
What should i do? is the request can be sent using AJAX? or there is PHP code for this? i have been reading a lot about this subject but none enter my head. Really hope you guys help me out .
Please let me know if you need more information so i can provide it to you.
EDIT : Problem solved and just posting the small editing that i did to the code that was provided in the correct answer that i marked .
Thanks to Mr. Anonymous for the big help that he gave me . His answer was so so close, all what i had to do is just edit his code a little bit and everything went good .
I will list the finial code down bellow in case any other developer had this issue or wanted to do an HTTP request .
First what i did is that i stored the data that i wanted to send over the HTTP in a file with a JSON type :
{
"criteria": {
"landmarkId": 181,
"checkInDate": "2018-02-25",
"checkOutDate": "2018-02-30"
}
}
Second thing as what guys can see what Mr. Anonymous posted .
<?php
header('Access-Control-Allow-Origin: *');
$SiteID= 'My Site Id';
$ApiId= 'My Api Id';
$url = 'Base URL';
// Here i will get the data that i created in Json data type
$data = file_get_contents("data.json");
// I guess this step in not required cause the data are already in JSON but i had to do it for myself
$arrayData = json_decode($data, true);
$ch = curl_init();
//curl_setopt($ch, CURLOPT_HEADER, true);
curl_setopt($ch, CURLOPT_URL,$url);
curl_setopt($ch, CURLOPT_POST, TRUE);
curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
curl_setopt($ch, CURLOPT_USERPWD, "$SiteID:$ApiID");
curl_setopt($ch, CURLOPT_HTTPHEADER, array(
'Content-Type: application/json',
'Connection: Keep-Alive',
'Authorization: $SiteID:$ApiId'
));
curl_setopt($ch, CURLOPT_POSTFIELDS,json_encode($arrayData));
$result = curl_exec($ch);
curl_close($ch);
print_r($result);
?>

Answer 1

Try this
$site_id = 'your_site_id';
$api_key = 'your_api_key';
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'http://api-connect-url');
curl_setopt($ch, CURLOPT_POST, 1);
############ Only one of the statement as per condition ###########
//if they have asked for post
curl_setopt($ch, CURLOPT_POSTFIELDS, "$site_id=$api_key" );
//or if they have asked for raw post
curl_setopt($ch, CURLOPT_POSTFIELDS, "$site_id:$api_key" );
####################################################################
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["$site_id:$api_key"] );
$api_response = curl_exec ($ch);
curl_close ($ch);
As asker need to send JSON Payload to API
$site_id = 'your_site_id';
$api_key = 'your_api_key';
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'http://api-connect-url');
curl_setopt($ch, CURLOPT_POST, 1);
//send json payload
curl_setopt($ch, CURLOPT_POSTFIELDS, "{
"criteria":{
"cityId":9395,
"area":{
"id":0,
"cityId":0
},
"landmarkId":0,
"checkInDate":"2017-09-02",
"checkOutDate":"2017-09-03",
"additional":{
"language":"en-us",
"sortBy":"PriceAsc",
"maxResult":10,
"discountOnly":false,
"minimumStarRating":0,
"minimumReviewScore":0,
"dailyRate":{
"minimum":1,
"maximum":10000
},
"occupancy":{
"numberOfAdult":2,
"numberOfChildren":1
},
"currency":"USD"
}
}
}"
);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["$site_id:$api_key", 'Content-Type:application/json'] );
$api_response = curl_exec ($ch);
curl_close ($ch);