Ajax + Php Pass Variable

Question

How can I send a variable through Ajax and recover the value in PHP?

<script type="text/javascript"> 
setInterval(function(){
$.ajax({
async: true,
url: 'contalog.php',
dataType: 'html',
type: 'POST',
cache: false,
success: function(result){ 
// mandar a variavel $logado que vem do arquivo requisitado aqui acima ....
} 
}); 
}, 1000); 
</script>

And use it like this in my PHP, ...

echo $logado;

I need the Ajax run from time to time, send to the variable $logado that is in the PHP.

I know if I wear one include works but I need time on time via Ajax to always have the variable updated.

Answer 1

If you need to check from time to time, consider using Long Polling to do so.

First of all, you’d have to change his code for him to use setTimeout with recursion, instead of using setInterval, on account of the problems described in that question

(function log() {


    $.ajax({
        url: 'contalog.php',
        type: 'POST',
        success: function(result) { 

            // A variável retornada pelo "contalog.php"
            verificarLogado(result.logado);

            // Só executa no caso de success:
            setTimeout(log, 1000);
        } 
    }); 

})(); 

function verificarLogado(logado) {
    if (logado) {
      alert('Está logado');
    } else {
      alert('Não está logado');
    }
}

In your file contalog.php, you must convert the output to the format JSON and use the correct header for browser recognition:

 #Trecho do código do AP postado no PASTBIN
 // Seleciona da tabela
$sql = "SELECT * FROM logado WHERE hora > :hora GROUP BY ip";
$sql = $pdo->prepare($sql);
$sql->bindValue(":hora", date('H:i:s', strtotime("-2 minutes")));
$sql->execute();
$logado = $sql->rowCount();

// Trecho importante

header('Content-Type: application/json');

echo json_encode(['logado' =>  $logado]);

exit();