/src/include/lib/checkcode.php

<?php

/**

 * ???????

 * @copyright (c) Emlog All Rights Reserved

 * $Id: checkcode.php 1792 2010-10-21 14:50:08Z emloog $

 */



session_start();



$randCode = '';

$chars = 'abcdefghjkmnpqrstuvwxyzABCDEFGHJKLMNPRSTUVWXYZ23456789';

for ( $i = 0; $i < 4; $i++ ){

	$randCode .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);

}



$_SESSION['code'] = strtoupper($randCode);



$img = imagecreate(55,22);

$bgColor = isset($_GET['mode']) && $_GET['mode'] == 't' ? imagecolorallocate($img,245,245,245) : imagecolorallocate($img,255,255,255);

$pixColor = imagecolorallocate($img,mt_rand(30, 180), mt_rand(10, 100), mt_rand(40, 250));



for($i = 0; $i < 4; $i++){

	$x = $i * 13 + mt_rand(0, 4) - 2;

	$y = mt_rand(0, 3);

	$text_color = imagecolorallocate($img, mt_rand(30, 180), mt_rand(10, 100), mt_rand(40, 250));

	imagechar($img, 5, $x + 5, $y + 3, $randCode[$i], $text_color);

}

for($j = 0; $j < 50; $j++){

	$x = mt_rand(0,55);

	$y = mt_rand(0,22);

	imagesetpixel($img,$x,$y,$pixColor);

}



header('Content-Type: image/png');

imagepng($img);

imagedestroy($img);