03demo-response-headers.php

<?php

/***
 * Reading response headers from an API call using cURL
 * * This script demonstrates how to make an API call using cURL in PHP,
 * * and how to read the response headers and body.
 * 
 * */

//using curl for api call
$ch = curl_init();
// curl_setopt($ch, CURLOPT_URL, );
// curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

//set headers
$headers = [
   "Authorization: Client-ID A1XKO9j45wVD3gjxvLicqMyiIfOx1ekm9UMMIUsjrbQ"
];

$responseHeaders = [];
// Define a callback function to handle the headers
$header_callback = function($ch, $header) use (&$responseHeaders) {
    // Parse the header line
    $len = strlen($header);
    $header = explode(':', $header, 2);
    if (count($header) < 2) {
        // Invalid header line
        return $len;
    }
    // Store the header name and value
    $responseHeaders[trim($header[0])] = trim($header[1]);
    return $len;
};

curl_setopt_array($ch, [
    // CURLOPT_URL => 'http://api.weatherapi.com/v1/current.json?key=e81d26fea2c54855b4d153248251506&q=Bhubaneswar&aqi=yes',
    CURLOPT_URL => 'https://api.unsplash.com/photos/random',
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HTTPHEADER => $headers,
    // CURLOPT_HEADER => true, // Include the header in the output for checking response headers
    CURLOPT_HEADERFUNCTION => $header_callback

]);

// Execute the cURL request and get the response
// This will return the response as a string instead of outputting it directly
$response = curl_exec($ch);

//get the http status code
$statusCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);

//checking the content type and content length from the response headers
$contentType = curl_getinfo($ch, CURLINFO_CONTENT_TYPE);
$contentLength = curl_getinfo($ch, CURLINFO_CONTENT_LENGTH_DOWNLOAD);


curl_close($ch);

// Output the response and status code
echo "HTTP Status Code: " . $statusCode . "<br/>";

print_r($responseHeaders);

echo $response . "<br/>";