Allow multiple requests from the same PHP user [closed]

This is probably because of SESSION or TRANSACTION .

PHP does not limit the number of concurrent connections (NGINX, Apache, or other extensions or other firewalls).

1. Session:

Session can not be accessed by more than one process in write-read mode. You can read through countless processes, but you can not write.

Logo:

session_start();

$salvaSession = $_SESSION['ultimo_acesso'] = time();
$lerSession = $_SESSION['usuario'];

 // Seu código demorado....
while(1 = 1){ // Um loop infinito para simbolizar algo demorado :P
}

If you make a request, it will prevent any other requests from being accepted while the loop is closed.

This is because session_start indicates that the session can be read and written, which prevents access from any other process.

So, to fix use:

session_start();

$salvaSession = $_SESSION['ultimo_acesso'] = time();

session_write_close();

$lerSession = $_SESSION['usuario'];

 // Seu código demorado....
while(1 = 1){ // Um loop infinito para simbolizar algo demorado :P
}

Ready, from the "third" line you already allow another process to have access to the same session. Because you say to PHP: "I will not write anything more in this session". You will still be able to read after using session_write_close(); . ;)

Then after session_write_close(); the other request can be processed, which does not require finishing the loop. : D

2. TRANSACTION:

This is more complex and is related to the database (not to PHP). Depends on the level of solos used in the database or queries.

For example:

mysqli_begin_transaction($con);
mysqli_autocommit($con, false);

mysqli_query($con, 'SELECT * FROM usuarios WHERE id = 1 FOR UPDATE');

 // Seu código demorado....
while(1 = 1){ // Um loop infinito para simbolizar algo demorado :P
}

mysqli_commit($sql);

If you go back to this page, it will not be processed on a second tab, because MySQL will prevent the query from being read while there is no UPDATE or COMMIT , this will depend on Engine used, Banco de dados used and the level of 'Isolation!'

Would not you like to put some action while loading the requisitions?

$.ajax({
        type : 'POST',
        url  : 'suaPagina.php',
        data : data,
        dataType: 'json',
        beforeSend: function()
        {   
            $(".item").html(''); //<-- ação aqui

        },
    });