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Shassain
Asked: 2020-09-30 13:28:46 +0800 CST 2020-09-30 13:28:46 +0800 CST

Error connecting WebSocket php - javascript

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I'm practicing webSocketand trying to make a connection phpwith javascript - html5to be able to chat later, so I have the following in the servidor.php.

$host="127.0.0.1";
$port="3333";
$socket= socket_create(AF_INET,SOCK_STREAM,0);
socket_bind($socket,$host,$port) or die("error al vincular socket en el cliente");
echo socket_strerror(socket_last_error());
socket_listen($socket);
$i=0;
while(true){
    $client[$i++]=socket_accept($socket);
    $menssage=socket_read($client[$i], 1024);
    echo $menssage;
    $menssage="Hola".$menssage."\n";

    socket_write($client[$i], $menssage."\n\r",1024);
    socket_close($client[$i]);
}
socket_close($socket);

And I make a request from my client as follows:

    $("#conectar").click(function(){
        token=document.querySelector('meta[name="csrf-token"]').getAttribute('content');
        conectar(token)
    });
    function conectar(tokenuser){
        loadDoc("ws://127.0.0.1:3333",tokenuser, myFunction);
    }
    function loadDoc(url,clave ,cFunction) {
        if ("WebSocket" in window) {
            var ws = new WebSocket(url);
            ws.onopen = function (clave) {
                ws.send(clave);
            };
            ws.onerror = function (error) {
                console.log('WebSocket Error');
            };
            ws.onmessage = function (evt) {
                cFunction(evt.data);
            };
            ws.onclose = function () {
                console.log("el WS fue cerrado");
            };
        }else{
            console.log("descargue chrome");
        }
    }
    function myFunction(resultado) {
        console.log(resultado);
    }

Once everything is encoded, I run the service:

C:\Users\minombre>php -f C:\xampp\htdocs\webSocket\servidor.php
La operacin se complet correctamente.

And so far so good, but once I press Connect it throws me an error on the server side:

PHP Notice: Undefined offset: 1 in C:\xampp\htdocs\webSocket\server.php on line 12

Notice: Undefined offset: 1 in C:\xampp\htdocs\webSocket\server.php on line 12 PHP Warning: socket_read() expects parameter 1 to be resource, null given in C:\xampp\htdocs\webSocket\server.php online 12

Warning: socket_read() expects parameter 1 to be resource, null given in C:\xampp\htdocs\webSocket\server.php on line 12 PHP Notice: Undefined offset: 1 in C:\xampp\htdocs\webSocket\server.php online 16

Notice: Undefined offset: 1 in C:\xampp\htdocs\webSocket\server.php on line 16 PHP Warning: socket_write() expects parameter 1 to be resource, null given in C:\xampp\htdocs\webSocket\server.php online 16

Warning: socket_write() expects parameter 1 to be resource, null given in C:\xampp\htdocs\webSocket\server.php on line 16 PHP Notice: Undefined offset: 1 in C:\xampp\htdocs\webSocket\server.php online 17

Notice: Undefined offset: 1 in C:\xampp\htdocs\webSocket\server.php on line 17 PHP Warning: socket_close() expects parameter 1 to be resource, null given in C:\xampp\htdocs\webSocket\server.php online 17

Warning: socket_close() expects parameter 1 to be resource, null given in C:\xampp\htdocs\webSocket\server.php on line 17

I don't know what I did wrong, if someone could help me I would really appreciate it.

php

1 Answers

  1. Best Answer

    Without testing it, I'd say your problem is here:

    $i = 0;
$client[$i++] = ...

    There you start with $i === 0, and then you increment it , with what $ihappens to be worth 1. Then when you do

    socket_write( $client[$i], ...
socket_close( $client[$i] );

    You're actually accessing with $i === 1, which you don't have defined within the array .

    The simplest solution: increment $i at the end of the loop:

    while( true ) {
  $client[$i] = socket_accept( $socket );
//          ^-- CAMBIA ESTO
  $menssage = socket_read( $client[$i], 1024 );
  echo $menssage;
  $menssage = "Hola" . $menssage . "\n";

  socket_write( $client[$i], $menssage . "\n\r", 1024 );
  socket_close( $client[$i] );
  ++$i; // <-- AQUÍ
}
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