How to store the data into an array in numeric form?

[ahana]

i have got information posted from html form into a php file. i have accessed it through $_POST array. now i want to store these values in an array in numeric form but they always turn out to be string. i have to generate pie charts using it but it is not working as the rest of the code will only accept integer data. what should i do?

<?php
require_once ('C:\wamp\www\new project\jp_graph\src\jpgraph.php');
require_once ('C:\wamp\www\new project\jp_graph\src\jpgraph_pie.php');
require_once ('C:\wamp\www\new project\jp_graph\src\jpgraph_pie3d.php');

$d1=$_POST['s1'];
$d2=$_POST['s2'];
$d3=$_POST['s3'];
$d4=$_POST['s4'];
$d5=$_POST['s5'];

$data= array($d1,$d2,$d3,$d4,$d5);

//there is no error in this part of the code
//it works fine if i pass integer values in array.
$graph = new PieGraph(400,200,'auto');
$graph->SetShadow();

// Set A title for the plot
$graph->title->Set("3D Pie Client side image map");
$graph->title->SetFont(FF_FONT1,FS_BOLD);

// Create
$p1 = new PiePlot3D($data);
$p1->SetLegends(array("Jan (%d)","Feb","Mar","Apr","May","Jun","Jul"));
$targ=array("pie3d_csimex1.php?v=1","pie3d_csimex1.php?v=2","pie3d_csimex1.php?v=3",
			"pie3d_csimex1.php?v=4","pie3d_csimex1.php?v=5","pie3d_csimex1.php?v=6");
$alts=array("val=%d","val=%d","val=%d","val=%d","val=%d","val=%d");
$p1->SetCSIMTargets($targ,$alts);

// Use absolute labels
$p1->SetLabelType(1);
$p1->value->SetFormat("%d kr");

// Move the pie slightly to the left
$p1->SetCenter(0.4,0.5);

$graph->Add($p1);


// Send back the HTML page which will call this script again
// to retrieve the image.
$graph->StrokeCSIM();



?>

[Dormilich]

$x = (int) $_POST['key'];