echo servers in php and go

fork.php

<?php

$server = stream_socket_server('tcp://127.0.0.1:8000');
while (true) {
    $client = stream_socket_accept($server, -1);
    if (pcntl_fork() === 0) {
        stream_copy_to_stream($client, $client);
        die;
    }
    fclose($client);
    while (pcntl_wait($status, WNOHANG));
}

goroutine.go

package main

import (
	"io"
	"net"
)

func main() {
	server, _ := net.Listen("tcp", "127.0.0.1:8000")
	for {
		client, _ := server.Accept()
		go func() {
			io.Copy(client, client)
			client.Close()
		}()
	}
}

single.go

package main

import (
	"io"
	"net"
)

func main() {
	server, _ := net.Listen("tcp", "127.0.0.1:8000")
	for {
		client, _ := server.Accept()
		io.Copy(client, client)
		client.Close()
	}
}

single.php

<?php

$server = stream_socket_server('tcp://127.0.0.1:8000');
while (true) {
    $client = stream_socket_accept($server, -1);
    stream_copy_to_stream($client, $client);
    fclose($client);
}