<?php
error_reporting(0);
require(__DIR__ . "/config.php");
session_start();
//session_register('VerificationCode');
$_SESSION[PREFIX . 'VerificationCode'] = '';
$width                                  = '60'; //图片宽
$height                                 = '30'; //图片高
$textall = array_merge_recursive(range('0', '9'));
$code = '';
for ($i = 0; $i < 4; $i++) {
	$tmptext  = mt_rand(0, 9);
	$randtext = $textall[$tmptext];
	$code .= $randtext;
}

$_SESSION[PREFIX . 'VerificationCode'] = $code;

header("Expires: -1");
header("Cache-Control: no-store, private, post-check=0, pre-check=0, max-age=0", FALSE);
header("Pragma: no-cache");

if (function_exists('imagecreate') && function_exists('imagecolorset') && function_exists('imagecopyresized') && function_exists('imagecolorallocate') && function_exists('imagesetpixel') && function_exists('imagechar') && function_exists('imagecreatefromgif') && function_exists('imagepng')) {
	
	$im              = imagecreate($width, $height);
	$backgroundcolor = imagecolorallocate($im, 255, 255, 255);
	
	$numorder = array(
		1,
		2,
		3,
		4
	);
	shuffle($numorder);
	$numorder = array_flip($numorder);
	
	for ($i = 1; $i <= 4; $i++) {
		$x          = $numorder[$i] * 13 + mt_rand(0, 4) - 2;
		$y          = mt_rand(0, 3);
		$text_color = imagecolorallocate($im, mt_rand(50, 255), mt_rand(50, 128), mt_rand(50, 255));
		imagechar($im, 5, $x + 5, $y + 3, $code[$numorder[$i]], $text_color);
	}
	$linenums = mt_rand(10, 32);
	for ($i = 0; $i <= $linenums; $i++) {
		$linecolor = imagecolorallocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
		$linex     = mt_rand(0, $width);
		$liney     = mt_rand(0, $height);
		imageline($im, $linex, $liney, $linex + mt_rand(0, 4) - 2, $liney + mt_rand(0, 4) - 2, $linecolor);
	}
	
	for ($i = 0; $i <= 40; $i++) {
		$pointcolor = imagecolorallocate($im, mt_rand(50, 255), mt_rand(50, 255), mt_rand(50, 255));
		imagesetpixel($im, mt_rand(0, $width), mt_rand(0, $height), $pointcolor);
	}
	
	$bordercolor = imagecolorallocate($im, 150, 150, 150);
	imagerectangle($im, 0, 0, $width - 1, $height - 1, $bordercolor);
	
	header('Content-type: image/png');
	imagepng($im);
	imagedestroy($im);
	
} else {
	
	$numbers = array(
		0 => array(
			'3c',
			'66',
			'66',
			'66',
			'66',
			'66',
			'66',
			'66',
			'66',
			'3c'
		),
		1 => array(
			'1c',
			'0c',
			'0c',
			'0c',
			'0c',
			'0c',
			'0c',
			'0c',
			'1c',
			'0c'
		),
		2 => array(
			'7e',
			'60',
			'60',
			'30',
			'18',
			'0c',
			'06',
			'06',
			'66',
			'3c'
		),
		3 => array(
			'3c',
			'66',
			'06',
			'06',
			'06',
			'1c',
			'06',
			'06',
			'66',
			'3c'
		),
		4 => array(
			'1e',
			'0c',
			'7e',
			'4c',
			'2c',
			'2c',
			'1c',
			'1c',
			'0c',
			'0c'
		),
		5 => array(
			'3c',
			'66',
			'06',
			'06',
			'06',
			'7c',
			'60',
			'60',
			'60',
			'7e'
		),
		6 => array(
			'3c',
			'66',
			'66',
			'66',
			'66',
			'7c',
			'60',
			'60',
			'30',
			'1c'
		),
		7 => array(
			'30',
			'30',
			'18',
			'18',
			'0c',
			'0c',
			'06',
			'06',
			'66',
			'7e'
		),
		8 => array(
			'3c',
			'66',
			'66',
			'66',
			'66',
			'3c',
			'66',
			'66',
			'66',
			'3c'
		),
		9 => array(
			'38',
			'0c',
			'06',
			'06',
			'3e',
			'66',
			'66',
			'66',
			'66',
			'3c'
		)
	);
	
	for ($i = 0; $i < 10; $i++) {
		for ($j = 0; $j < 6; $j++) {
			$a1 = substr('012', mt_rand(0, 2), 1) . substr('012345', mt_rand(0, 5), 1);
			$a2 = substr('012345', mt_rand(0, 5), 1) . substr('0123', mt_rand(0, 3), 1);
			mt_rand(0, 1) == 1 ? array_push($numbers[$i], $a1) : array_unshift($numbers[$i], $a1);
			mt_rand(0, 1) == 0 ? array_push($numbers[$i], $a1) : array_unshift($numbers[$i], $a2);
		}
	}
	
	$bitmap = array();
	for ($i = 0; $i < 20; $i++) {
		for ($j = 0; $j < 4; $j++) {
			$n     = substr($code, $j, 1);
			$bytes = $numbers[$n][$i];
			$a     = mt_rand(0, 14);
			switch ($a) {
				case 1:
					str_replace('9', '8', $bytes);
					break;
				case 3:
					str_replace('c', 'e', $bytes);
					break;
				case 6:
					str_replace('3', 'b', $bytes);
					break;
				case 8:
					str_replace('8', '9', $bytes);
					break;
				case 0:
					str_replace('e', 'f', $bytes);
					break;
			}
			array_push($bitmap, $bytes);
		}
	}
	
	for ($i = 0; $i < 8; $i++) {
		$a = substr('012', mt_rand(0, 2), 1) . substr('012345', mt_rand(0, 5), 1);
		array_unshift($bitmap, $a);
		array_push($bitmap, $a);
	}
	
	$image = pack('H*', '424d9e000000000000003e000000280000002000000018000000010001000000' . '0000600000000000000000000000000000000000000000000000FFFFFF00' . implode('', $bitmap));
	
	header('Content-Type: image/bmp');
	echo $image;
}
