checkbox value

[sandy1028]

if(isset($_POST["submit_plot"])){

$checklist=$_POST['check_list'];

echo "<img src=\"./linegraph.php?v1=$checklist\">";

I have passed the checkbox value to linegraph.php in the image.

In Linegraph.php

$param=$_REQUEST['v1'];

The graph is not plotted.
The values passed from the checkbox to linegraph.php should be in the format

$param=array('bw','cpu','auser','gs','cnt','rj','mem','pkt','rtt','qj');

Depending on the value checked the $param should form an array.

[leatherback]

Did you check:
IF $checklist is an array, you cannot pass the info like that. you need to re-create the array in the image script from individual parameters passed, or by condensing the array to a string (e.g., with [man]implode[/man]), and exploding the string into an array again in the script.