How to capture full HTTP request data (headers and body) using PHP?

An old question, but for those who need to do this in the future ... The best (perhaps only) way would be to completely control the server as a server.

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<?php
//Read the port number from first parameter on the command line if set
$port = (isset($argv[1])) ? intval($argv[1]) : 80;

//Just a helper
function dlog($string) {
    echo '[' . date('Y-m-d H:i:s') . '] ' . $string . "\n";
}

//Create socket
while (($sock = @socket_create(AF_INET, SOCK_STREAM, SOL_TCP)) === false) {
    dlog("socket_create() failed: reason: " . socket_strerror(socket_last_error()));
    sleep(1);
}

//Reduce blocking if previous connections weren't ended correctly
if (!socket_set_option($sock, SOL_SOCKET, SO_REUSEADDR, 1)) {
    dlog("socket_set_option() failed: reason: " . socket_strerror(socket_last_error($sock)));
    exit;
}

//Bind to port
$tries = 0;
while (@socket_bind($sock, 0, $port) === false) {
    dlog("socket_bind() failed: reason: " . socket_strerror(socket_last_error($sock)));
    sleep(1);
    $tries++;
    if ($tries>30) {
        dlog("socket_bind() failed 30 times giving up...");
        exit;
    }
}

//Start listening
while (@socket_listen($sock, 5) === false) {
    dlog("socket_listen() failed: reason: " . socket_strerror(socket_last_error($sock)));
    sleep(1);
}

//Makes it possible to accept several simultaneous connections
socket_set_nonblock($sock);

//Keeps track of active connections
$clients = array();

dlog("server started...");

while(true) {
    //Accept new connections
    while (($msgsock = @socket_accept($sock)) !== false) {
        //Prevent blocking
        socket_set_nonblock($msgsock);

        //Get IP - just for logging
        socket_getpeername($msgsock, $remote_address);

        //Add new client to array
        $clients[] = array('sock' => $msgsock, 'timeout' => time()+30, 'ip' => $remote_address);

        dlog("$remote_address connected, client count: ".count($clients));
    }
    //Loop existing clients and read input
    foreach($clients as $key => $client) {
        $rec = '';
        $buf = '';
        while (true) {
            //Read 2 kb into buffer
            $buf = socket_read($clients[$key]['sock'], 2048, PHP_BINARY_READ);

            //Break if error reading
            if ($buf === false) break;

            //Append buffer to input
            $rec .= $buf;

            //If no more data is available socket read returns an empty string - break
            if ($buf === '') break;
        }
        if ($rec=='') {
            //If nothing was received from this client for 30 seconds then end the connection
            if ($clients[$key]['timeout']<time()) {
                dlog('No data from ' . $clients[$key]['ip'] . ' for 30 seconds. Ending connection');

                //Close socket
                socket_close($client['sock']);

                //Clean up clients array
                unset($clients[$key]);
            }
        } else {
            //If something was received increase the timeout
            $clients[$key]['timeout']=time()+30;

            //And.... DO SOMETHING
            dlog('Raw data received from ' . $clients[$key]['ip'] . "\n------\n" . $rec . "\n------");
        }
    }

    //Allow the server to do other stuff by sleeping for 50 ms on each iteration
    usleep(50000);
}

//We'll never reach here, but some logic should be implemented to correctly end the server
foreach($clients as $key => $client) {
    socket_close($client['sock']);
}
@socket_close($sock);
exit;

8080, php filename.php 8080 .