<?php
/*
* Example
*
* include("verify.php");
* session_start();
* $v = new VerifyCode();
* print($v->getCode());
* $code = isset($_SESSION['SE_verifycode']) ? $_SESSION['SE_verifycode'] : "";
* print("Print it out for debug : {$code}<br>");
* print($v->checkCode($code) ? "check success" : "check failed");
*
*/
class VerifyCode
{
var $codeLength = 4;
var $codeColor = "#888888";
var $codeDisturb = "#666666";
var $bgColor = "#eeeeee";
var $bgDisturb = "#cccccc";
var $version = "Build 20050512";
var $author = "aDang @ bbs.freecity.cn";
var $code = array(
array(array(0,1,1,1,0), array(0,1,0,1,0), array(0,1,0,1,0), array(0,1,0,1,0), array(0,1,0,1,0), array(0,1,1,1,0)),
array(array(0,0,1,0,0), array(0,0,1,0,0), array(0,0,1,0,0), array(0,0,1,0,0), array(0,0,1,0,0), array(0,0,1,0,0)),
array(array(0,1,1,1,0), array(0,0,0,1,0), array(0,0,1,0,0), array(0,1,0,0,0), array(0,1,0,0,0), array(0,1,1,1,0)),
array(array(0,1,1,1,0), array(0,0,0,1,0), array(0,1,1,1,0), array(0,0,0,1,0), array(0,0,0,1,0), array(0,1,1,1,0)),
array(array(0,1,0,1,0), array(0,1,0,1,0), array(0,1,1,1,0), array(0,0,0,1,0), array(0,0,0,1,0), array(0,0,0,1,0)),
array(array(0,1,1,1,0), array(0,1,0,0,0), array(0,1,1,1,0), array(0,0,0,1,0), array(0,0,0,1,0), array(0,1,1,1,0)),
array(array(0,1,1,1,0), array(0,1,0,0,0), array(0,1,1,1,0), array(0,1,0,1,0), array(0,1,0,1,0), array(0,1,1,1,0)),
array(array(0,1,1,1,0), array(0,0,0,1,0), array(0,0,0,1,0), array(0,0,1,0,0), array(0,0,1,0,0), array(0,0,1,0,0)),
array(array(0,1,1,1,0), array(0,1,0,1,0), array(0,1,1,1,0), array(0,1,0,1,0), array(0,1,0,1,0), array(0,1,1,1,0)),
array(array(0,1,1,1,0), array(0,1,0,1,0), array(0,1,0,1,0), array(0,1,1,1,0), array(0,0,0,1,0), array(0,1,1,1,0)),
);
function getCode()
{
$verifyCode = $this->_getRandNum($this->codeLength);
$_SESSION['SE_verifycode'] = $verifyCode;
return $this->_getTable($verifyCode);
}
function checkCode($code)
{
$verifyCode = isset($_SESSION['SE_verifycode']) ? $_SESSION['SE_verifycode'] : "";
if(isset($_SESSION['SE_verifycode']))
unset($_SESSION['SE_verifycode']);
return $code == $verifyCode;
}
function _getTable($str)
{
$str = "$str";
$ret = "";
for($l = 0; $l < strlen($str); $l++){
$ret .= "<table border='0' cellspacing='0' cellpadding='0' align='left'>";
for($i = 0; $i < 6; $i++){
$ret .= "<tr>";
for($j = 0; $j < 5; $j++){
$color = $this->code[$str[$l]][$i][$j] ? (rand(1, 3) == 1 ? $this->codeDisturb : $this->codeColor) : (rand(1, 3) == 1 ? $this->bgDisturb : $this->bgColor);
$ret .= "<td width='3' height='3' bgcolor='{$color}'><img name='' src='' width='1' height='1' alt=''></td>";
}
$ret .= "</tr>";
}
$ret .= "</table>";
}
return $ret;
}
function _getRandNum($length)
{
$code = "";
$base = ord('0');
list($mSec, $Sec) = explode(' ', microtime());
srand((float) $Sec + ((float) $mSec * 100000));
for($i = 0; $i < $length; $i++){
$num = rand() % 10;
$code .= chr($base + $num);
}
return $code;
}
}
?>
