Digital verification code and digital operation verification code implemented in php, php digital verification code operation_PHP tutorial

Digital verification code and digital operation verification code implemented in php, php digital verification code operation

This article describes the digital verification code and digital operation verification code implemented in php. Share it with everyone for your reference. The details are as follows:

1. Digital verification code:

<&#63;php
//第一个实例是数字验证码，最常见的验证码。多少个数字可以由自己决定。
//$num是生成的验证码包含几个数字
getValidate(4,60,20);
function getValidate($num,$w,$h){
  $code = "";
  for($i=0;$i<$num;$i++){
    $code .= rand(0,9);
  }
  //code变量最后是$num个数字，并且是字符串。因袭如果是生成四位的数字验证码，可以用rand(1000,9999)生成
  Header("Content-type:image/PNG");
  $img = imagecreate($w,$h);//创建图片，长宽参数是一开始定义好的。
  $black = imagecolorallocate($img,0,0,0);//定义黑色
  $gray = imagecolorallocate($img,200,200,200);//定义灰色
  $bgcolor = imagecolorallocate($img,255,255,255);//背景色白色
  imagefill($img,0,0,$gray);
  //imagefill($image,ing $x,int $y,int $color),在image图像的坐标x,y处用color颜色执行区域填充
  //给验证码画上边框，感觉验证码美美的,其实呢画边框就是给他画上一个矩形
  imagerectangle($img,0,0,$w-1,$h-1,$black);//用黑色的框框
  /*imagestring($image,$font,$x,$y,$s,$col)
  用col颜色将字符串s画到image所代表的图像的x,y处（xy是字符串的左上角坐标），
  整幅图像的左上角为(0,0)如果font是1，2，3，4，5则使用内置字体*/
  //一下是画四个数字的方法，让四个字符位置都随机等
  $strx = rand(5,10);
  for($i = 0;$i < $num;$i++){
    $strops = rand(1,6);
    imagestring($img,5,$strx,$strops,substr($code,$i,1),$black);
    $strx += rand(8,12);
    //strx是横坐标，需要每一次加上之前的坐标，保证不会重叠。纵坐标不管
  }
  //substr() 函数返回字符串的一部分,substr(string,start,length),要截取的字符串，start开始位置，length截取的长度
  //生成好了数字，下面要给验证码区域一些干扰，防止一些工具可以自动识别
  //1.方法一：给背景加上很多噪点
  //imagesetpixel($image,$x,$y,$color),在image图像中用color颜色在x,y坐标(图像左上角为0,0)上画一个点
  for($i = 0;$i<80;$i++){
    imagesetpixel($img, rand(0,$w), rand(0,$h), $black);//这些点分布在这个背景里面
  }
  //2.方法二：绘制几条虚线
  $style = array($black,$gray);
  imagesetstyle($img, $style);
  //imagesetstyle($image,$style),设定画线的风格，像素组成的数组
  $y1 = rand(0,$h);
  $y2 = rand(0,$h);
  $y3 = rand(0,$h);
  $y4 = rand(0,$h);
  imageline($img,0,$y1,$w,$y2,IMG_COLOR_STYLED);
  imageline($img,0,$y3,$w,$y4,IMG_COLOR_STYLED);
  imagepng($img);
  imagedestroy($img);
}
&#63;>

2. Number operation verification code:

<&#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;>

I hope this article will be helpful to everyone’s PHP programming design.

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