PHP graphic number verification code_PHP tutorial

php graphic number verification code

I debugged all the following codes and passed them. Run authpage.php.



/*

* Filename: authpage.php

*/

srand((double)microtime()*1000000);

//Verify whether the user input is consistent with the verification code

if(isset($_POST['authinput']))

{


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

echo "Verification successful!";

else

echo "Verification failed!"; 

}

//Generate a new four-digit integer verification code

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

?>

Please enter the verification code:




>

>

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


/*

* Filename: authimg.php

*/
//Generate verification code image
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 the four-digit integer verification code into the picture

imagestring($im, 5, 10, 8, $HTTP_GET_VARS['authnum'], $white);

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

{

imagesetpixel($im, rand()%70 , rand()%30 , $gray);

}

ImagePNG($im);

ImageDestroy($im);

　?>
____________________

java->struts

http://www.bkjia.com/PHPjc/845133.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/845133.htmlTechArticlephp graphic number verification code The following codes have all passed my debugging. Run authpage.php. ? /* * Filename: authpage.php */ srand((double)microtime()*1000000); //Verify whether the user input...