assigning $_SESSION

[xyrhou]

Is it possible to call the $random in another page? i used the $random as a filename in the image that was converted from movie to jpeg.

 
$random = rand(1000000, 9999999); 
$_SESSION['random']=$random;
 
 

im planning to use the $random from page1.php in page2.php in these code to filter the url that im planning to display.

$sql = mysql_query("SELECT * FROM image WHERE url = '" . $random. "'") or die(mysql_error());    
 

my problem is i cant pass the $random from page1.php to page2.php..

Please help im a newbie to php.

[philipwayne]

Yes use sessions, you need to start the session each time your going to use it.

session_start( )

[Markus]

A quick sessions example:

user.php

<?php
 
// Start the session before you do anything else!
session_start();
 
// Use the $_SESSION super-global array to store data in session
$_SESSION['username'] = "Markus";
$_SESSION['userage'] = 19;
?>
 
<a href="hello.php">Go to hello.php</a>
 

hello.php

<?php
 
// Remember to start the session!
session_start();
 
// Any data you stored can be accessed via the same super-global
printf('Your name is %s, and you are %d years old!',
    $_SESSION['username'],
    $_SESSION['userage']
);
 

[xyrhou]

Can you assign another variable to Session? Like this:

$random = rand (100 , 200)
$_SESSION['random'] = "$random";
 

So that when i start session again in another page its value is the last $random?

[Markus]

Yes .

[xyrhou]

Thanks you so much. What a great community..

Im going to try to apply it on my code.

If i have further questions am i going to post another? or post it in this thread?

Thank you again!!

[Markus]

You're welcome :)

If you have more questions on this topic, then go ahead and post it in this thread. Otherwise, if the question is on another topic, make a new thread.

Mark.

[xyrhou]

When i tried putting a session on my pixel.php i got these error:
i got a

    header("location: pic.php");

at the end of the pixel.php

Do the header affect the Session?

Here is the error:

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at C:\xampp\htdocs\WWW\Sneakers\files\pic.php:2) in C:\xampp\htdocs\WWW\Sneakers\files\pic.php on line 5

The pixel.php is the one responsible in converting a swf movie to an image then saving it with filename $random = rand(1111, 9999); to the database

the pic.php is the one responsible in calling the url of the image then previewing the image.


Do i need to post the exact code here?

[xyrhou]

Here is the code for pic.php

 
<?php
 
session_start();
include("connection.php");
 
    echo "Pageviews = ". $_SESSION['random'];    //checking if Session is passed
 
    $ImgID = $_SESSION['random'];
            $filename= $random;
            $path = 'images/' . $filename . '.jpg';
        $sql = mysql_query("SELECT * FROM image WHERE ImgID = '" . $ImgID . "'") or die(mysql_error());    
        $row = mysql_fetch_array($sql);
 
 
 
 
            echo "<center>";
            echo "<img src=view.php?image=". $row['url'] . "&amp;mode=resize&amp;size=350x500 />";
            echo "<br/>";
 
 
 
        echo "<br/>";    
 
?>
 

Here is the pixel.php

 
<?php
session_start();
    include('connection.php');
error_reporting(0);
/**
 * Get the width and height of the destination image
 * from the POST variables and convert them into
 * integer values
 */
$w = (int)$_POST['width'];
$h = (int)$_POST['height'];
 
// create the image with desired width and height
 
$img = imagecreatetruecolor($w, $h);
 
// now fill the image with blank color
// do you remember i wont pass the 0xFFFFFF pixels 
// from flash?
imagefill($img, 0, 0, 0xFFFFFF);
 
$rows = 0;
$cols = 0;
 
// now process every POST variable which
// contains a pixel color
for($rows = 0; $rows < $h; $rows++){
    // convert the string into an array of n elements
    $c_row = explode(",", $_POST['px' . $rows]);
    for($cols = 0; $cols < $w; $cols++){
        // get the single pixel color value
        $value = $c_row[$cols];
        // if value is not empty (empty values are the blank pixels)
        if($value != ""){
            // get the hexadecimal string (must be 6 chars length)
            // so add the missing chars if needed
            $hex = $value;
            while(strlen($hex) < 6){
                $hex = "0" . $hex;
            }
            // convert value from HEX to RGB
            $r = hexdec(substr($hex, 0, 2));
            $g = hexdec(substr($hex, 2, 2));
            $b = hexdec(substr($hex, 4, 2));
            // allocate the new color
            // N.B. teorically if a color was already allocated 
            // we dont need to allocate another time
            // but this is only an example
            $test = imagecolorallocate($img, $r, $g, $b);
            // and paste that color into the image
            // at the correct position
            imagesetpixel($img, $cols, $rows, $test);
        }
    }
}
 
// print out the correct header to the browser
//header("Content-type:image/jpeg");
// display the image
//imagejpeg($img, "", 90);
 
$random = rand(1000000, 9999999); 
$_SESSION['random']=$random;
 
$username = $_SESSION['username'];
$userid = $_SESSION['userid'];
$ImgID = $_SESSION['ImgID'];
 
    $filename = $random; //filename setting
    $path = 'images/' . $filename . '.jpg'; // url of the image
 
    imagejpeg($img,$path,90);
 
    $qInsertImage = mysql_query("INSERT INTO image(url,ImgTitle) VALUES('".$path."' , '".$filename."')") or die(mysql_error()); // save to database
 
 
 
 
    header("location: pic.php");    
?>
 

[philipwayne]

The headers already sent error just means output has already been sent to the browser no header modifications can happen. Either use output buffering or make sure to open the session before outputting anything.

Also do note that any whitespace is still a character which means it is still output make sure there are no newlines/tabs/spaces in front of the opening PHP tag.

[xyrhou]

Thank you so much it works now.. ^_^