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Publish a graphical number verification code_PHP tutorial

WBOYOriginal: 2016-07-13 17:12:18797browse

The following codes all passed my debugging. Run authpage.php.
/*
* Filename: authpage.php
*/
srand((double)microtime()*1000000);
//Verify whether the user input is consistent with The verification code is consistent
if(isset($_POST['uthinput']))
{
if(strcmp($_POST['authnum'],$_POST['authnum'])==0)
echo "Verification successful!";
else
echo "Verification failed!";
}
//Generate a new four-digit integer verification code
while(($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 image
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);

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