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

dumprequest.php

<?php
// https://gist.github.com/magnetikonline/650e30e485c0f91f2f40
class DumpHTTPRequest {
	public function execute($targetFile) {
		$data = sprintf(
			"%s %s %s\n\nHTTP headers:\n",
			$_SERVER['REQUEST_METHOD'],
			$_SERVER['REQUEST_URI'],
			$_SERVER['SERVER_PROTOCOL']
		);
		foreach ($this->getHeaderList() as $name => $value) {
			$data .= $name . ': ' . $value . "\n";
		}
		file_put_contents(
			$targetFile,
			$data . "\nResponse body:\n" . file_get_contents('php://input') . "\n"
		);
		header('Content-Type: text/plain');
		echo("Done!\n\n" . $data);
	}
	private function getHeaderList() {
		$headerList = array();
		foreach ($_SERVER as $name => $value) {
			if (preg_match('/^HTTP_/',$name)) {
				// convert HTTP_HEADER_NAME to Header-Name
				$name = strtr(substr($name,5),'_',' ');
				$name = ucwords(strtolower($name));
				$name = strtr($name,' ','-');
				// add to list
				$headerList[$name] = $value;
			}
		}
		return $headerList;
	}
}
$d = new DumpHTTPRequest;
$d->execute('./dumprequest.txt');

example.output.txt

GET /dumprequest.php HTTP/1.1

HTTP headers:
Host: localhost
Connection: keep-alive
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.81 Safari/537.36
Referer: http://localhost/
Accept-Encoding: gzip, deflate, sdch
Accept-Language: en-GB,en-US;q=0.8,en;q=0.6

Response body: