Draws a simple GD pie chart showing used space over total space. Requires GD of course.

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By : andrew

<?php
define("DISK","/home/"); //Enter the Drive/Mount point/Directory that you want to generate a space usage graph for.
$total = round(disk_total_space(DISK)/1024/1024,2); //Get the total diskspace

$free = round(disk_free_space(DISK)/1024/1024,2);
$used = $total - $free; //Find used space

$used = round(($used/$total)*100); //Calculate used space when rounded
$free = round(($free/$total)*100); //Calculate free space

//Generate pie chart
define("WIDTH", 500); //Width may break if changed
define("HEIGHT", 220); //Again height may break it when changed
$data[0] = $used;
$data[1] = $free;

$img = imagecreate(WIDTH-100, HEIGHT); //Start the images

$background = $white = imagecolorallocate($img, 112,128,144); //Set background
$black = imagecolorallocate($img, 0, 0, 0); //Set colours, black in this case

$center_x = (int)WIDTH/2; //Calculate image centre for x
$center_y = (int)HEIGHT/2; //Calculate image centre for y

imagerectangle($img, 0, 0, WIDTH-101, HEIGHT-1, $black); //Draw the backrgound border
$color[0] = imagecolorallocate($img, 159,182,205);
$color[1] = imagecolorallocate($img, 198,226,255);
$last_angle = 0;

//Draw the pie chart on the percentage of disk space
for($i=0; $i<count($data); $i++) {
$arclen = (360 * $data[$i]) / 100;
imagefilledarc($img, $center_x - 120, $center_y, 200, 200, $last_angle, ($last_angle + $arclen), $color[$i],IMG_ARC_PIE);


$last_angle += $arclen;

}

//Turn the used space into gigabytes
$used = round(($used*$total)/100/1024,2);
imagestring($img, 5, 250, $center + 30,
"Used Space: ".$data[0]."%", $color[0]); //Draw info onto the main shape

imagestring($img, 5, 250, $center + 60,
"Free Space: ".$data[1]."%", $color[1]);
//Same as above but for free space

imagerectangle($img, 240, $center+10, 390, $center+100, $black);

imagestring($img, 5, $center_x, $center + 200,
$used."Gb / ".($total/1024)."Gb", $black);

// Used space / Total Space

header("Content-Type: image/png"); //Content type png

imagepng($img); //Draw image to browser
imagedestroy($img); //Destroy the image resource

?>

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