PHP script to dump full HTTP request to file (method, HTTP headers and body).

dumprequest.php

<?php
// Original from https://gist.github.com/magnetikonline/650e30e485c0f91f2f40

class DumpHTTPRequestToFile
{
    public function execute($targetFile, $append = true): void
    {
        $data = sprintf(
            "%s\n%s %s %s\n\nHTTP headers:\n",
            date("Y-m-d H:i:s"),
            $_SERVER['REQUEST_METHOD'],
            $_SERVER['REQUEST_URI'],
            $_SERVER['SERVER_PROTOCOL']
        );

        foreach ($this->getHeaderList() as $name => $value) {
            $data .= $name . ': ' . $value . "\n";
        }

        $data .= "\nRequest body:\n";
        $data .= file_get_contents('php://input') . "\n\n";
        $data .= "======================================================================" . "\n\n";

        $flag = $append ? FILE_APPEND : null;
		file_put_contents($targetFile, $data, $flag);

		echo("Done!\n\n");
	}

    private function getHeaderList(): array
    {
        $headerList = [];
        foreach ($_SERVER as $name => $value) {
            if (0 === strpos($name, "HTTP_")) {
                // convert HTTP_HEADER_NAME to Header-Name
                $name = str_replace('_', ' ', substr($name, 5));
                $name = ucwords(strtolower($name));
                $name = str_replace(' ', '-', $name);

                // add to list
                $headerList[$name] = $value;
            }
        }

        return $headerList;
    }
}


(new DumpHTTPRequestToFile)->execute('./dumprequest.txt');

example.output.txt

2021-11-17 14:49:12
GET /dumprequest.php HTTP/1.1

HTTP headers:
Accept-Language: en-GB,en-US;q=0.9,en;q=0.8
Accept-Encoding: gzip, deflate, br
Referer: http://localhost/
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8
User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.62 Safari/537.36
Upgrade-Insecure-Requests: 1
Connection: keep-alive
Host: localhost

Request body:
{"arg":123}

======================================================================