PHP Code:
Copy Code code as follows:
<?php
class Captcha_code
{
var $width = ' 60 ';
var $num = ' 4 ';
var $height = ' 20 ';
var $name = ' Randcode ';
Public Function __construct ($conf = "")
{
if ($conf!= "")
{
foreach ($conf as $key => $value)
{
$this-> $key = $value;
}
}
}
function Show ()
{
Header ("Content-type:image/gif");
/*
* Initialization
*/
$border = 0; Do you want to have a border 1:0 Don't
$how = $this->num; Verify number of code digits
$w = $this->width; Picture width
$h = $this->height; Picture Height
$fontsize = 5; Font size
$alpha = "ABCDEFGHIJKMNOPQRSTUVWXYZ"; CAPTCHA Content 1: Letter
$number = "023456789"; Authenticode Content 2: Digital
$randcode = ""; Authentication Code String Initialization
Srand (Double) microtime () *1000000); Initialization of random number seed
$im = imagecreate ($w, $h); Create a validation picture
/*
* Draw Basic frame
*/
$bgcolor = imagecolorallocate ($im, 255, 255, 255); Set Background color
Imagefill ($im, 0, 0, $bgcolor); Fill background Color
if ($border)
{
$black = imagecolorallocate ($im, 0, 0, 0); Set Border color
Imagerectangle ($im, 0, 0, $w-1, $h-1, $black);//Draw Border
}
/*
* generates random characters on a per-bit basis
*/
for ($i =0; $i < $how; $i + +)
{
$alpha _or_number = Mt_rand (0, 1); A letter or a digital
$str = $alpha _or_number? $alpha: $number;
$which = Mt_rand (0, strlen ($str)-1); which character to take
$code = substr ($str, $which, 1); Take character
$j = $i? 4: $j +15; Draw character Position
$color 3 = imagecolorallocate ($im, Mt_rand (0,100), Mt_rand (0,100), Mt_rand (0,100)); Character immediately color
Imagechar ($im, $fontsize, $j, 3, $code, $color 3); Painting character
$randcode. = $code; Step-by-step addition of Authenticode string
}
/*
* Add Interference
*/
for ($i =0 $i <5; $i + +)//Draw background interference line
{
$color 1 = imagecolorallocate ($im, Mt_rand (0,255), Mt_rand (0,255), Mt_rand (0,255)); Interference Line Color
Imagearc ($im, Mt_rand ( -5, $w), Mt_rand ( -5, $h), Mt_rand (20,300), Mt_rand (20,200), $color 1); Interference Line
}
for ($i =0; $i < $how *15 $i + +)//Draw background interference points
{
$color 2 = imagecolorallocate ($im, Mt_rand (0,255), Mt_rand (0,255), Mt_rand (0,255)); Interference point Color
Imagesetpixel ($im, Mt_rand (0, $w), Mt_rand (0, $h), $color 2); Jamming Point
}
//Writes the CAPTCHA string to the session
//$this->session->set_userdata (Array ($this->name=> $randcode));
$_session[$this->name]= $randcode;
/* Drawing End * *
imagegif ($im);
Imagedestroy ($im);
/* Drawing End * *
}
}
?>
Invoke PHP Code:
Copy Code code as follows:
function Verify_image () {
$conf [' name '] = ' verify_code ';
as configuration parameter
$this->load->library (' Lib_captcha ', $conf);
$this->lib_captcha->show ();
$yzm _session = $this->session->userdata (' Verify_code ');
echo $yzm _session;
}
HTML code:
Copy Code code as follows:
<dl>
<dt> Verification Code:</dt>
<dd>
<input type= "text" name= "Verify_text" id= "Verify_text" class= "Yzma" value= "" >
<img src= "/user/verify_image" alt= "Authentication Code" id= "Verify_code" class= "yz_img"/>
<a href= "Javascript:changecode ();" class= "Change_yz" > Change a sheet </a>
</dd>
<dd class= "Tips_wrong" ><b> authentication code not correct </b></dd>
<dd class= "Tips_correct" ></dd>
</dl>
JS Code:
Copy Code code as follows:
<script type= "Text/javascript" >
function ChangeCode () {
Fs.query ("#verify_code"). src = "/user/verify_image?r=" + math.random ();
}
</script>
