How Can I Make Asynchronous GET Requests in PHP?

Asynchronous GET Requests in PHP

Making asynchronous GET requests in PHP allows for efficient communication with external scripts without blocking the main thread.

Using file_get_contents()

For GET requests where the output is not required, file_get_contents() can be employed:

$output = file_get_contents('http://www.example.com/');

Asynchronous Requests with fsockopen()

To make asynchronous requests without waiting for a response, you can use fsockopen():

function make_async_get($url) {
    $parts = parse_url($url);
    $fp = fsockopen($parts['host'],
        isset($parts['port']) ? $parts['port'] : 80,
        $errno, $errstr, 30);
    
    $out = "GET ".$parts['path']." HTTP/1.1\r\n";
    $out.= "Host: ".$parts['host']."\r\n";
    $out.= "Connection: Close\r\n\r\n";
    
    fwrite($fp, $out);
    fclose($fp);
}

make_async_get('http://www.externalsite.com/script1.php?variable=45');

In this example, the socket is opened, the GET request is sent, and the socket is immediately closed without reading the response.

Note: If you require the output of the GET request, consider using curl_post_async() as shown in the referenced solution.

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