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Editorial Team
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Asked: 2026-05-25T12:59:04+00:00

I have a problem with Session_start() here : Warning : session_start() [function.session-start]: Cannot send

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I have a problem with Session_start() here :

Warning: session_start() [function.session-start]: Cannot send session cache limiter – headers already sent (output started at C:\xampp\htdocs\pages\home.php:4) in C:\xampp\htdocs\charts\home-chart.php on line 2

and in home-chart.php in line 2 I wrote codes like this : 

session_start();
.
.
.
echo ' username: '.$_SESSION['user_name'];

although with this warning i can get result of $_SESSION['user_name'] but when I try to clear this part of the code :

session_start();

I can’t see any result in screen.
so, what’s your solution?

<?php
@session_start();
require_once '../class/chart.class.php';
$chart = new chart();
?>
<html>
    <head>
        <link href='../css/home-chart.css'  rel='stylesheet' type='text/css' />
    </head>
    <body>
        <div class='float_left' style="margin-bottom:20px;">
            <div class='float_left' style='line-height: 9.41px; font-size: x-small;'>0<br /></div>      <div class='float_left' style="background-image: url('../image/web/chart.png'); width: 367px; height: 226px; " >
                <!-- 1 --><div class='float_left float_left column' style='margin-left:2px;'>
                    <?php echo $chart->mysql_fetch($chart->daycal(-3)); ?>
                </div>  
                <!-- 2 --><div class='float_left float_left column'>
                    <?php echo $chart->mysql_fetch($chart->daycal(-2)); ?>
                </div>  
                <!-- 3 --><div class='float_left column' >
                    <?php echo $chart->mysql_fetch($chart->daycal(-1)); ?>
                </div>  
                <!-- 4 --><div class='float_left column' >
                    <?php echo $chart->mysql_fetch($chart->daycal(0)); ?>
                </div>  
                <!-- 5 --><div class='float_left column' >
                    <?php echo $chart->mysql_fetch($chart->daycal(1)); ?>
                </div>  
                <!-- 6 --><div class='float_left column' >
                    <?php echo $chart->mysql_fetch($chart->daycal(2)); ?>
                </div>  
                <!-- 7 --><div class='float_left column' >
                    <?php echo $chart->mysql_fetch($chart->daycal(3)); ?>
                </div>  
            </div>


            <div class='float_single_full' ></div>
            <div class='float_left bottom_chart' style="margin-left:10px;"><?php echo $chart->dayofweek(-3); ?></div>
            <div class='float_left bottom_chart'><?php echo $chart->dayofweek(-2); ?></div>
            <div class='float_left bottom_chart'><?php echo $chart->dayofweek(-1); ?></div>
            <div class='float_left bottom_chart'  style='font-weight:bold'><?php echo $chart->dayofweek(0); ?></div>
            <div class='float_left bottom_chart'><?php echo $chart->dayofweek(1); ?></div>
            <div class='float_left bottom_chart'><?php echo $chart->dayofweek(2); ?></div>
            <div class='float_left bottom_chart'><?php echo $chart->dayofweek(3);
                    echo ' username: ' . $_SESSION['user_name'];
                    ?></div>
        </div>
    </body>
</html>
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1 Answer

  1. Editorial Team

    If you even have blank lines before the <?php tag, then you can’t set headers. Your start of file, with line numbers, should look like this:

    1. <?php
2. session_start();
3. header('Cache-control: private');

    The message says “headers sent at line 2”, so you’re outputting something (a space, a blank line, whatever) on line 4 of home.php

    If this file is an include, you should put your session_start(); at the top of home.php instead, and then you don’t need it in this file.

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