Php graphic digit Verification Code

Php graphic digit Verification Code

All of the following code has been debugged by myself. Run authpage. php.

<?

/*

* 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 "Verification Successful! ";

Else

Echo "Verification Failed! ";

}

// Generate a new four-digit integer Verification Code

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

?>

<Form action = authpage. php method = post>

<Table>

Enter the verification code: <input type = text name = authinput style = "width: 80px"> <br>

<Input type = submit name = "verify" value = "submit verification code">

<Input type = hidden name = authnum value = <? Echo $ authnum;?>



</Table>

</Form>

Bytes -------------------------------------------------------------------------------------------------------------

<?
/*

* Filename: authimg. php

*/
// Generate a verification code Image
Header ("Content-type: image/PNG ");

Srand (double) microtime () * 1000000 );

$ Im = imagecreate (58,28 );

$ Black = ImageColorAllocate ($ im, 0, 0 );

$ White = ImageColorAllocate ($ im, 255,255,255 );

$ Gray = ImageColorAllocate ($ im, 200,200,200 );

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

// Print 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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Java-> struts