PHP Add Verification Code

How to add a verification code to a registered PHP website?
Ask the Great God for advice
The simplest four numbers, that's all.
Online wait Ah!!!

Reply to discussion (solution)

---------captcha generator-------//public function verify_image () {//Generate Captcha Picture header ("content-type:image/png");//full digit $STR = " 2,3,4,5,6,7,8,9,a,b,c,d,f,g,h,i,j,k,m,n,p,q,r,s,t,u,v,w,x,y,z "; To display the characters, you can make additions and deletions $list = explode (",", $str); $cmax = count ($list)-1; $verifyCode = "; for ($i =0; $i < 5; $i + +) {$randnu m = Mt_rand (0, $cmax); $verifyCode. = $list [$randnum];        Remove the characters, the combination becomes the captcha character we want}//$_session[' code ' = $verifyCode;    Put characters in session//$this->session->set_userdata (' Code ', $verifyCode); $im = Imagecreate (58,28);     Generate Picture $black = Imagecolorallocate ($im, 0,0,0); This bar and the following three are set for the color $white = Imagecolorallocate ($im, 255,255,255); $gray = Imagecolorallocate ($im, 200,200,200); $red =     Imagecolorallocate ($im, 255, 0, 0); Imagefill ($im, 0,0, $white);    Fill the picture with color//Draw the captcha into the picture imagestring ($im, 5, 8, $verifyCode, $black);    Write the captcha to the picture for ($i =0; $i <50; $i + +) {Imagesetpixel ($im, Rand (0,58), Rand (0,28), $black);    Added dot-like interferon imagesetpixel ($im, Rand (0,58), Rand (0,28), $red); Imagesetpixel ($im, Rand(0,58), Rand (0,28), $gray);    Imagearc ($im, Rand (0,58), Rand (0,28), (a), (a), (a), $black);    Added arc-shaped interferon//imageline ($im, Rand (0,58), Rand (0,28), Rand (0,58), Rand (0,28), $red); Added line-like interferon}imagepng ($im); Imagedestroy ($im);}

Will this be another single file or directly add to the original?

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Session_Start ();
Include ("config/config.php");
Include ("ip.php");
if (! $isREG) Die ("The account registration function is turned off, please wait for open re-registration!");
if ($_post) {
Submit
Include_once ("config/function_common.php");
$illegal =illegalsubmit ();
if (! $illegal) Die ("Prohibit unlawful submission");
$POST =addslashess ($_post);

Include_once ("config/mysql_new_class.php");
$con =new Mysql_class ($SQLhost, $SQLuser, $SQLPWD, $DATABASE);

Whether the account exists
$sql = "Select Username,password from Oluc_user where username= ' $POST [username] '";
$USR = $con->queryrow ($sql);

$i = $POST [' IP '];
$pass 1 = Rawurlencode (Base64_encode ($POST [' Password ']);
$pass 2 = Rawurlencode (Base64_encode ($POST [' Repassword ']);
if ($pass 1!= $pass 2) {
Die ("");
}else{
if (! $usr)
{
$sql = "INSERT into Oluc_user (USERNAME,PASSWORD,CREATETIME,CREATEIP) VALUES (' $POST [UserName] ', ' $POST [PassWord] ', now (), ' $i ');
mysql_query ($sql);
$username =rawurlencode (Base64_encode ($POST [username]);
$password =rawurlencode (Base64_encode ($POST [password]);
$url = ' login.php ';
Header ("Location: $url");
Exit
Die ("");
}else{die ("");}
}
Mysql_close ();
}
?>




<title><?php echo $Title?> Change Password</title>






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Mine is this kind of advice!!!

Verification Code:
function Create_code () {

document.getElementById (' Code2 '). src = ' verify_image ';
}

Can the great God be added directly to my hair?
I don't know anything about this.
It's trouble.


Thank you very much thank you!!!

Where do you put your verification code?

I don't understand it at all.

$code = Mt_rand (1000,9999); $_session[' code '] = $code;

echo $_sesssion[' code ';

Take a look at GD2 and draw it yourself.

In fact, you can go to the verification of the background to download a their SDK, direct installation can be used, it is convenient to view the background data. The key is the security is very high oh, do not have to do their own programming, swipe to get it done. http://www.geetest.com/

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