PHP - Why Won't This Work Arg! Dynamic Png Graph

Redirect to login with dynamic URL (?p=) doesn't work

I have two webpages that I want to be accessible only when the user is logged in. One for admin and one for other users. When a user who isn't logged in arrive to these pages I want to redirect the page to login.php. This doesn't work with the website I am working on.

I use this script on the startpage:

Code: [Select]
<?php    
if(file_exists($_GET['p'].".php")){
     include($_GET['p'].".php");
} 

else{
if(empty($_GET['p']) OR $_GET['p'] == ""){
  include("main.php");
      } 

else{
    include("404.php");
    }   
}
?>    

and therefore my links have this format: ?p=mapp/filnamn and it doesn't work with header('Location: /?p=admin/login');

If I skip this script and use ordinary links header('Location: /admin/login.php'); it works, but I don't want to be forced to copy the same code over and over again to get header, footer, leftbar and rightbar on every single page.

I have almost teared my brain apart to find a solution but in vain. Today I have been sitting in front of the computer almost the whole day with this problem, but no luck. I don't even know what to search for. What is it I don't understand? Not long time ago I hade another problem just because I use dynamic links.

This is the script I use on the page that I don't want to be accessible if you aren't logged in:


Code: [Select]
<?php 
session_start();
$username = $_SESSION['username'];

include ('functions.php');
db_connect();

if(!empty($_SESSION['username'])){
$sql = mysql_query("SELECT username, usertype FROM users WHERE username='$username'");
$result = mysql_num_rows($sql);
$row = mysql_fetch_array($sql);

if($_SESSION['username'] = $username AND $row['usertype']==1){
$_SESSION['username'] = $username;
$user_welcome = "Welcome ".$username;
}

else{
//header('Location: /?p=admin/login');
die("<a href='?p=admin/login'>You have to login as admin to access this page!</a>");
}
}

else{
//header('Location: /?p=admin/login');
die("<a href='?p=admin/login'>You have to login to access this page</a>");
}
?>
I use "die" because it is the only way for me to make it work, but I want to use what is in the comments. Maybe it's not such a bad idea to use the method I use today, but the problem is that when I get the message that I have to login to view the page, the rightbar disappear and the page therefor looks stupid.

Another question I am wondering about, is if the above script is secure? It doesn't feel like it, but maybe the security is all about the loginpage?

hi guys  ..I want to create graphs in php. Data will be taken by mysql ofcourse... I have seen lots of options like fusion chart xml, phpgraphlib and so on...

my question is

What will be the best library or tool. What will be your recommendation to create graphs.

Thanks

Hi All,

Are there any decent PHP graph solutions out there?

I have an SQL statement that returns 12 numberical values in an array (mssql_fetch_array).

I would like to plot these values on a graph.

Thanks
Matt

I'm working on PHP Math for my assignment, and it requires a graph to show the functions.
But, i have no idea how to build a x-y-z (3D) graph.... All codes that i have search only for 2-dimensional (x-y axis) only..

Is there any help or solutions to make a 3-dimensional graph using PHP or Javascript?

thank you before

Hi everyone,

Newish to PHP and I'm sure this is a simple thing but I was hoping someone could help me out.

I have a php file that draws a graph for me (it takes in the coordinates from a text file). What I want to do is insert a red line at the top of the graph (not from start to finish, but starting at a certain point in the graph and finishing at another point).

This php code achieves the line I would like to insert into the graph:

<?php
$canvas = imagecreatetruecolor(1000, 10);

// Allocate colors
$red = imagecolorallocate($canvas, 255, 0, 0);

ImageFilledRectangle($canvas, 0, 0, 1000, 10, $red);


// Output and free from memory
header('Content-Type: image/jpeg');

imagejpeg($canvas);
imagedestroy($canvas);
?>


I need to insert this into this php script:

<?php
$width = 1000; //width and height of the resulting image
$height = 230;

$drawLastLine = false; //draw 9th line or not
$testMode = false; //render only 10 images



//returns directory with cached images by name of text file
function getCacheDirectory($fname)
{
    $mod = filemtime($fname);
    $dirname = "cache/" . $fname . "." . $mod . "/";
    return $dirname;
}

//checks if specified txt file is cached
function isCached($fname)
{
    $dirname = getCacheDirectory($fname);
    return file_exists($dirname);
}

//calculated y-coordinates of base-lines for all 9 lines, returns an array
function initStart($height, $number = 9)
{
    $d = $number + 1;
    $t = $height / $d;
    $res = array();
    $c = 0;
    for ($i = 0; $i < $number; $i++)
    {
        $c += $t;
        $res[$i] = $c;
    }
    return $res;
}


//draws vertical grey line with specified coordinate
function drawVerticalLine($img, $x)
{
    $grey = imagecolorallocate($img, 80, 80, 80);
    $h = imagesy($img);
    imagesetthickness($img, 3);
    imageline($img, $x, 0, $x, $h, $grey);
    imagesetthickness($img, 0.1);
}

//cuts unfilled part of image in the right, making its width equal to $realW
function cutRight($img, $realW)
{
    $h = imagesy($img);
    $new = imagecreatetruecolor($realW, $h);
    imagecopy($new, $img, 0, 0, 0, 0, $realW, $h);
    return $new;
}

//makes up an array of required colors
function allocateColors($img)
{
    $result = array();
    $result['blue'] = imagecolorallocate($img, 0, 0, 255);
    $result['red'] = imagecolorallocate($img, 255, 0, 0);
    $result['black'] = imagecolorallocate($img, 0, 0, 0);
    $result['white'] = imagecolorallocate($img, 255, 255, 241);
    return $result;
}

//main function which generates all the images
function generateImages($fname)
{
    
    set_time_limit(0); //there's no time limit, because it's long process
    global $width, $height, $start, $testMode, $drawLastLine;
    
    $lines = 9;
    $start = initStart($height, $drawLastLine ? $lines : $lines - 1);

    //colors of line from top bo bottom
    $lineCol = array('blue', 'blue', 'red', 'red', 'blue', 'blue', 'black', 'red', 'red');
    
    $fp = fopen($fname, "r"); //we open our file with data
    $header = fgets($fp);

    $curX = 0;
    $sumX = 0;
    $imgNum = 1;

    $colors = false;
    $const = 1.0; //that's the constant which can be used to multiply by y-coordinates, i.e. making our graphs scalable by y-coordinate

    $prevY = array();
    for ($i = 0; $i < $lines; $i++)
    {
        $prevY[$i] = 0;
    }

    $dir = getCacheDirectory($fname);
    mkdir($dir);
    $img = false;

  //  $maximumImages = 10;

    //if we are testing, we will do just 10 images, else we will work until the file ends
    while ((!$testMode || ($testMode && $imgNum < $maximumImages)) && $line = fgets($fp))
    {
        //if it's time to make up a new image
        if ($sumX % $width == 0)
        {
            //we save old one to file
            if ($img)
            {
                imagegif($img, $dir . $imgNum . ".gif");
                $imgNum++;
            }
            //and create a new one, along with allocating colors and so on
            $img = imagecreatetruecolor($width, $height);
            $colors = allocateColors($img);
            imagefill($img, 0, 0, $colors['white']);
            $curX = 0;
        }
        $data = explode(",", $line);
        $time = array_shift($data);

        $linesCount = $drawLastLine ? $lines : $lines - 1;
        //we loop through our lines
        for ($i = 0; $i < $linesCount; $i++)
        {
            
            $ly = $data[$i] * $const; //it's the new Y coordinate, and we counts from baseline with y = 0
            $realTo = $start[$i] + $ly; //now we count the baseline too

            $realFrom = $start[$i] + $prevY[$i]; //that's the previous step's y-coordinate
            $prevY[$i] = $ly; //we remember current coordinate to draw line on next step

            $x1 = $curX - 1;
            $y1 = $realFrom;
            $x2 = $curX;
            $y2 = $realTo;
            //we draw line finally with needed color
            imageline($img, $x1, $y1, $x2, $y2, $colors[$lineCol[$i]]);
        }

        //if the time looks like 235.000000, we need to draw vertical line
        if (round($time) == $time)
        {
            drawVerticalLine($img, $curX);
        }

        //we increase both curX (which is used for drawing) and overall x (it indicates how much lines we've processed)
        $curX++;
        $sumX++;

    }

    // if we didn't save all lines to .gifs, we need to save leftovers
    if ($curX > 0)
    {
        $img = cutRight($img, $curX);
        imagegif($img, $dir . $imgNum . ".gif");
        $imgNum++;
    }

    //saving numbers of pictures rendered
    file_put_contents($dir . "info.txt", ($imgNum - 1));

}

$fname = $_GET['file'];

//there should be no slashes in filename and it should end with .txt
if (strpos($fname, "/") !== false || strpos($fname, "\\") !== false || strpos($fname, ".txt") === false)
{
    echo "Security error!";
    die;
}

//it should exist
if (!file_exists($fname))
{
    echo "No such file!";
    die;
}

//if there are no images cached for our file, we need to generate them
if (!isCached($fname))
{
    generateImages($fname);
}

$page = 1;
$dirname = getCacheDirectory($fname);
$maxPages = file_get_contents($dirname . "info.txt");
//$maxPages = 10;
$uniqid = uniqid();
$img = $dirname . $page . ".gif?" . uniqid();

include("templates/show2.php.inc");



I'm just lost as to how I achive this line in the longer php script. I've tried creating my own function, and then calling it further down but this just breaks it. Any help is appreciated!!