How to include php files containing "session_start ()", "echo", etc. in another php file, without the error "headers already sent"?

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How to include php files containing "session_start ()", "echo", etc. in another php file, without the error "headers already sent"?

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#1 by (0 votes)
#2 by (0 votes)

0

I have already investigated here in the Stack about such an error, but I have not found a way to solve my specific problem.

I have a file saved as PHP that works like an "index", basically full of HTML. Halfway through the file structure, in body , I want to insert a hit counter on the site and an online user display. I made a PHP file for each of these two things and included (with "include") within this "index". However, the following error occurred:

"Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at C:\wamp64\www\administrador\indexadmin.php:192) in C:\wamp64\www\administrador\usuariosonline.php on line 3
Call Stack
#   Time    Memory  Function    Location
1   0.0007  244648  {main}( )   ...\indexadmin.php:0
2   0.0050  265496  include( 'C:\wamp64\www\administrador\usuariosonline.php' ) ...\indexadmin.php:206
3   0.0050  265544  session_start ( )   ...\usuariosonline.php:3"

How to solve?

Here are the codes:

the "index.php" is this (no body):

<div class="col col-3">
<div class="visitassite">

    <h4>Visitas ao Site</h4>        

    <p>

    <?php include "totalvisitas.php"; ?>

    </p>
</div>
</div>


<div class="col col-3">
<div class="usuariosonline">

    <h4>Usuários Online</h4>        

    <p>

    <?php include "usuariosonline.php"; ?>

    </p>
</div>
</div>

The two php files being included are the following:

File totalvisitas.php :

<?php
try {
    $pdo = new PDO('mysql:host=localhost;dbname=contador', 'root', '');
}catch (PDOException $e){
    echo $e->getMessage();
}
$selecionar = $pdo->prepare("SELECT * FROM visitas");
$selecionar->execute();
$resultados = $selecionar->fetchAll(PDO::FETCH_ASSOC);
foreach($resultados as $results):
    echo "Total de visitas ao site: ".$results['visitas'];
    $contar = $results['visitas'] + 1;
    $update = $pdo->prepare("UPDATE visitas SET visitas=:visitas");
    $update->bindValue(':visitas', $contar);
    $update->execute();
endforeach;
?>

The other is this (usuariosonline.php):

<?php
session_start();
$session_path = session_save_path();
$visitors=0;
$handle = opendir($session_path);
while (($file = readdir ($handle)) != FALSE)
{
    if ($file!="."&&$file!="..")
    {
        if (preg_match("/^sess/",$file))
        $visitors++;
    }
}
echo "Há $visitors visitantes online.";
?>

php

asked by anonymous 28.12.2017 / 07:04

2 answers

mkdir (): Permission denied how to create top in php from database information

score 0 · Answer 1

Dude, I would change the way you do that.

would bring the includes to the top of the file

inside the includes, instead of the echo would throw the results for variables

finally where the includes were, it would echo the variables created by the includes.

score 0 · Answer 2

To solve the error related to the session can be used another approach. Basically you create a new file, for example session.php and put the following content:

//chama o session_start apenas se não tiver sido chamado anteriormente
function iniciar_sessao(){
    if(!(session_status() === PHP_SESSION_ACTIVE)){
        session_start();
    }
}

With this you can remove all calls to session_start in the other files, and pass the incluit to the top of each file (in the first line)

require_once 'sessao.php';
iniciar_sessao();

It will not be a problem if you call it more than once, because the iniciar_sessao() function already does the proper processing.