圖形數字驗證代碼_PHP

圖形數字驗證代碼Code:
/*

* Filename: authpage.php

*/



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



//驗證使用者輸入是否和驗證碼一致

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

{


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

echo "驗證成功！";

else

echo "驗證失敗！";

}



//產生新的四位整數驗證碼

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

?>



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

/*

* Filename: authimg.php

*/
//產生驗證碼圖片
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);



//將四位整數驗證碼繪入圖片

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



for($i=0;$i<50;$i++) //加入幹擾象素

{

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

}



ImagePNG($im);

ImageDestroy($im);

?>

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