discount.php

<?php

class DumpHTTPRequestToFile {
	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";
		}

		$data .= "\nRequest body:\n";

		file_put_contents(
			$targetFile,
			$data . file_get_contents('php://input') . "\n",
			FILE_APPEND | LOCK_EX
		);

		echo("Done!\n\n");
	}
		
	private function getHeaderList() {
		$headerList = [];
		foreach ($_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;
			}
		}
		$headerList['ip']  = isset($_SERVER['HTTP_CLIENT_IP']) 
					    ? $_SERVER['HTTP_CLIENT_IP'] 
					    : (isset($_SERVER['HTTP_X_FORWARDED_FOR']) 
					      ? $_SERVER['HTTP_X_FORWARDED_FOR'] 
					      : $_SERVER['REMOTE_ADDR']);
		return $headerList;
	}
}


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