Php implementation code for digital operation verification code, php digital operation verification code _ PHP Tutorial

Php implementation code of the digital operation verification code, php digital operation verification code. Php implementation code of the digital operation verification code, php digital operation verification code this article describes how php implements the digital operation verification code, the specific implementation method is as follows: phpgetValidate) php implementation code for digital operation verification code, php digital operation verification code

The example in this article describes how to implement a digital verification code in php. the specific implementation method is as follows:

<?phpgetValidate(100,30); function getValidate($w,$h){  $img = imagecreate($w,$h);   $gray = imagecolorallocate($img,255,255,255);  $black = imagecolorallocate($img,rand(0,200),rand(0,200),rand(0,200));  $red = imagecolorallocate($img, 255, 0, 0);  $white = imagecolorallocate($img, 255, 255, 255);  $green = imagecolorallocate($img, 0, 255, 0);  $blue = imagecolorallocate($img, 0, 0, 255);  imagefilledrectangle($img, 0, 0, 100, 30, $black);    for($i = 0;$i < 80;$i++){    imagesetpixel($img, rand(0,$w), rand(0,$h), $gray);  }    $num1 = rand(1,99);  $num2 = rand(1,99);   imagestring($img, 5, 5, rand(1,10), $num1, $red);  imagestring($img,5,30,rand(1,10),getRand(), $white);  imagestring($img,5,45,rand(1,10),$num2, $green);  imagestring($img,5,65,rand(1,10),"=", $blue);  imagestring($img,5,80,rand(1,10),"?", $red);      header("content-type:image/png");  imagepng($img);  imagedestroy($img);}function getRand(){  $code = rand(0,1);  switch ($code) {    case 0:      return "+";      break;    case 1:      return "-";      break;    default:      # code...      break;  }} ?>

Effect:

The above describes how to use php to implement the verification code for digital computation. I hope it will be helpful for your learning.

Examples in this article describes how php implements a digital verification code. the specific implementation method is as follows: phpgetValidate )...