Graphical digital validation Code _php tutorial

Graphical Digital Verification Code:
/*

* Filename:authpage.php

*/



Srand (Double) microtime () *1000000);



Verify that the user input is consistent with the verification code

if (Isset ($_post[' authinput '))

{


if (strcmp ($_post[' authnum '],$_post[' authinput ']) ==0)

echo "Verified success! ";

Else

echo "Verification failed! ";

}



Generate a new four-bit integer verification code

while (($authnum =rand ()%10000) <1000);

?>



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/*

* Filename:authimg.php

*/
Generate a Captcha picture
Header ("Content-type:image/png");

Srand (Double) microtime () *1000000);

$im = Imagecreate (58,28);

$black = Imagecolorallocate ($im, 0,0,0);

$white = Imagecolorallocate ($im, 255,255,255);

$gray = Imagecolorallocate ($im, 200,200,200);

Imagefill ($im, 68,30, $gray);



Drawing a four-bit integer verification code into a picture

Imagestring ($im, 5, 8, $HTTP _get_vars[' Authnum '), $white);



for ($i =0; $i <50; $i + +)//Add interfering pixels

{

Imagesetpixel ($im, Rand ()%70, Rand ()%30, $gray);

}



Imagepng ($im);

Imagedestroy ($im);

?>

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