<?php
#
#	File name:	image.php
#	Author:		Kingsley
#	Date:		06/06/2008
#	Time:		5:57 AM
#
header("Content-Type: image/png");
session_start();
$width = 150;
$height = 40;
$stringlen = 5;
if ($stringlen > 32){
	$stringlen = 32;
}
$stringsize = intval($height/2);
$randomsize = intval($stringsize * rand(90,110) * .01);
$im = imagecreate($width, $height); 
$chunksize = $width / $stringlen;
$xmax = intval($chunksize * $i + $chunksize) - $rightx;
$xmin = intval($chunksize * $i) - $leftx;
$ymax = intval($height) - $topy;
$ymin = intval($randomsize) - $bottomy;
$randx = rand($xmin, $xmax);
$randy = rand($ymin, $ymax);
$white = imagecolorallocate($im, 255, 255, 255);
$black = imagecolorallocate($im, 0, 0, 0);
srand((double)microtime()*1000000); 
$string = md5(rand(0,9999)); 
$new_string = substr($string, rand(0, 32-$stringlen), $stringlen);
$_SESSION['image_verify_string'] = $new_string;
imagefill($im, 0, 0, $black);
for ($i = 0; $i < $width*$height/10; $i++) {
	imagesetpixel($im, rand(0,$width), rand(0,$height), $white);
}
for($i = 0; $i <= 5; $i++) {
	if($i ==0) {
		$x = $i + 5 + rand(10,20);
	} elseif($i == 1){
		$x = 25 + rand(10, 20);
	} elseif($i == 2){
		$x = 45 + rand(10, 20);
	} elseif($i == 3){
		$x = 75 + rand(10,20);
	} elseif($i == 4){
		$x = 90 + rand(20,30);
	} elseif($i == 5){
		$x = 130 + rand(20,30);
	}		
	imagestring($im,$randomsize,$x,rand(3, 25),substr($new_string, $i, 1),$white);
}
imagepng($im);
imagedestroy($im); 
?>