Implementation code of php number operation verification code, php number operation verification code_PHP tutorial

Implementation code of php number operation verification code, php number operation verification code

The example in this article describes the method of implementing php number operation verification code. The specific implementation method is as follows:

<&#63;php
getValidate(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),"&#63;", $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;
  }
}
 
&#63;>

Realization effect:

The above introduces the method of using PHP to implement numerical operation verification code. I hope it will be helpful to everyone's learning.

http://www.bkjia.com/PHPjc/1040815.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/1040815.htmlTechArticleimplementation code of php number operation verification code, php number operation verification code This article tells the example of php realizing number operation verification code method, the specific implementation method is as follows: phpgetValidate(100,30)...