How to print all information from an HTTP request to the screen, in PHP

I need some PHP code that does a dump of all the information in an HTTP request, including headers and the contents of any information included in a POST request. Basically, a diagnostic tool that spits out exactly what I send to a server.

Does anyone have some code that does this?

Lastly:

print_r($_REQUEST);

That covers most incoming items: PHP.net Manual: $_REQUEST

Well, you can read the entirety of the POST body like so

echo file_get_contents( 'php://input' );

And, assuming your webserver is Apache, you can read the request headers like so

$requestHeaders = apache_request_headers();

A simple way would be:

<?php
print_r($_SERVER);
print_r($_POST);
print_r($_GET);
print_r($_FILES);
?>

A bit of massaging would be required to get everything in the order you want, and to exclude the variables you are not interested in, but should give you a start.

Nobody mentioned how to dump HTTP headers correctly under any circumstances.

From CGI specification rfc3875, section 4.1.18:

Meta-variables with names beginning with "HTTP_" contain values read from the client request header fields, if the protocol used is HTTP. The HTTP header field name is converted to upper case, has all occurrences of "-" replaced with "" and has "HTTP" prepended to give the meta-variable name.

foreach ($_SERVER as $key => $value) {
    if (strpos($key, 'HTTP_') === 0) {
        $chunks = explode('_', $key);
        $header = '';
        for ($i = 1; $y = sizeof($chunks) - 1, $i < $y; $i++) {
            $header .= ucfirst(strtolower($chunks[$i])).'-';
        }
        $header .= ucfirst(strtolower($chunks[$i])).': '.$value;
        echo $header.'<br>';
    }
}

Details: http://cmyker.blogspot.com/2012/10/how-to-dump-http-headers-with-php.html

Putting together answers from Peter Bailey and Cmyker you get something like:

<?php
foreach ($_SERVER as $key => $value) {
    if (strpos($key, 'HTTP_') === 0) {
        $chunks = explode('_', $key);
        $header = '';
        for ($i = 1; $y = sizeof($chunks) - 1, $i < $y; $i++) {
            $header .= ucfirst(strtolower($chunks[$i])).'-';
        }
        $header .= ucfirst(strtolower($chunks[$i])).': '.$value;
        echo $header."\n";
    }
}
$body = file_get_contents('php://input');
if ($body != '') {
  print("\n$body\n\n");
}
?>

which works with the php -S built-in webserver, which is quite a handy feature of PHP.

If you want actual HTTP Headers (both request and response), give hurl.it a try.

You can use the PHP command apache_request_headers() to get the request headers and apache_response_headers() to get the current response headers. Note that response can be changed later in the PHP script as long as content has not been served.

file_get_contents('php://input') will not always work.

I have a request with in the headers content-length=735 and php://input is empty string. So depends on how good/valid the HTTP request is.

in addition, you can use get_headers(). it doesn't depend on apache..

print_r(get_headers());