最简单的PHP socket echo server。

常有人困惑php的socket服务，现在有libevent和多线程了，但是我还是整一个select的
<?php
$addr = '0.0.0.0';
$port = 1234;
$socket = socket_create(AF_INET,SOCK_STREAM,SOL_TCP);

if (!socket_set_option($socket, SOL_SOCKET, SO_REUSEADDR, 1)) {
    echo 'Unable to set option on socket: '. socket_strerror(socket_last_error()) . PHP_EOL;
}

if($socket < 0) {
	echo "Socket create:".$socket_strerror($socket)."
";
	exit;
}

if (! ($ret = socket_bind($socket, $addr, $port)) ) {
	$cmd =isset($_SERVER['WINDIR'])? "netstat -an -o | find "".$port.""":"netstat -anp | grep "".$port.""";
	$output = NULL;
	exec( $cmd, $output , $return_var);
	echo "
	-----------------------------------------------		
	$cmd		
	<pre>";
	var_dump($output, $return_var);
	echo "/<pre>";
    //echo "//AS!
";
    exit;
}

if ( ($ret = socket_listen($socket, 5)) < 0 ) {
    echo "socket listen:".socket_strerror()."
";
    exit;
}

socket_set_nonblock($socket);

$clients = array($socket);
while(true) {
	$read = $clients;
	$writes=NULL;$execs=NULL;
	if(socket_select($read, $writes, $execs, 2) < 1){		
		echo ".";
		continue;
	}
	
	if(in_array($socket,$read)) {
		$newsock = socket_accept($socket);
		socket_set_nonblock($newsock);
		socket_getpeername($newsock,$remoteIP,$remotePort);		
		$userSN = $remoteIP.'_'.$remotePort;
		echo $userSN.' connetect in'.chr(10);
		$clients[$userSN] = $newsock;
		socket_write($newsock,'welcome '.$userSN.chr(10));
		continue;
	}
    
    foreach($read as $read_sock) {
		$data = @socket_read($read_sock, 2048, PHP_BINARY_READ);
		$data = trim($data);
		if(strlen($data) == 2048){
			socket_close($read_sock);
			continue;
		}
		@socket_getpeername($read_sock, $remoteIP, $remotePort);	
		$userSN = $remoteIP.'_'.$remotePort;
        echo $userSN.' say:'.$data.chr(10);
		socket_write($read_sock,'you say:'.$data);
    }
}
php s1.php
telnet 127.0.0.1 1234