PHP graphical Digital validation Code _php tutorial

PHP Graphical Digital Verification Code

The following code I debug all pass. Run authpage.php.



/*

* Filename:authpage.php

*/

Srand (Double) microtime () *1000000);

//Verify user input is consistent with 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);

?>



----------------------------------------------------------------------------------------------------------- --


/*

* Filename:authimg.php

*/
//Generate Verification code 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);

//Draw a four-bit integer verification code into the 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);

?>
__________________

java->struts

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