php数字运算验证码的实现代码

<?php
getValidate(100,30);
 
function getValidate($w,$h){
 $img = imagecreate($w,$h);
 
 $gray = imagecolorallocate($img,255,255);
 $black = imagecolorallocate($img,rand(0,200),200));
 $red = imagecolorallocate($img,0);
 $white = imagecolorallocate($img,255);
 $green = imagecolorallocate($img,0);
 $blue = imagecolorallocate($img,255);
 imagefilledrectangle($img,100,30,$black);
 
 
 for($i = 0;$i < 80;$i++){
  imagesetpixel($img,$w),$h),$gray);
 }
 
 
 $num1 = rand(1,99);
 $num2 = rand(1,99);
 
 imagestring($img,5,rand(1,10),$num1,$red);
 imagestring($img,getRand(),$white);
 imagestring($img,45,$num2,$green);
 imagestring($img,65,"=",$blue);
 imagestring($img,80,"?",$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;
 }
}
 
?>