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PHP制作验证码,php验证码_PHP教程

时间:2021-07-01 10:21:17 帮助过:21人阅读

PHP制作验证码,php验证码


PHP制作验证码详细教程

效果:

myvcode.class.php:封装创建验证码的类

   1: 
   2: /*
   3: * file:myvcode.class.php
   4: * 验证码类,类名Vcode
   5: */
   6: class Vcode
   7: {
   8:     private $width;              /*验证码宽度*/
   9:     private $height;             /*验证码高度*/
  10:     private $codeNum;            /*验证码字符个数*/
  11:     private $checkCode;            /*验证码字符*/
  12:     private $image;                /*验证码资源*/
  13:     private $pixNum;            /*绘制干扰点的个数*/
  14:     private $lineNum;            /*绘制干扰线的条数*/
  15:
  16:     /*
  17:     *构造方法实例化验证码对象,并初始化数据
  18:     *@param int $width         设置默认宽度
  19:     *@param int $height     设置默认高度
  20:     *@param int $codeNum    设置验证码中的字符个数
  21:     *@param int $pixNum        设置干扰点的个数
  22:     *@param int $lineNum    设置干扰线的数量
  23:     */
  24:     function __construct($width=80,$height=40,$codeNum=4,$pixNum=40,$lineNum=5)
  25:     {
  26:         $this->width = $width;
  27:         $this->height = $height;
  28:         $this->codeNum = $codeNum;
  29:         $this->pixNum = $pixNum;
  30:         $this->lineNum = $lineNum;
  31:     }
  32:     /*内部私有方法,创建图像资源*/
  33:     private function getCreateImage()
  34:     {
  35:         $this->image = imagecreatetruecolor($this->width, $this->height);
  36:         $white = imagecolorallocate($this->image,0xff,0xff,0xff);
  37:         imagefill($this->image, 0, 0, $white);
  38:         $black = imagecolorallocate($this->image,0,0,0);
  39:         imagerectangle($this->image, 0, 0, $this->width-1, $this->height-1, $black);
  40:     }
  41:     /*内部私有方法,绘制字符,去掉o0Llz和012*/
  42:     private function createCheckCode()
  43:     {
  44:         $code = '3456789abcdefghijkmnpqrstuvwxyABCDEFGHIJKMNPQRSTUVWXY';
  45:         $this->checkCode = "";
  46:         for($i=0; $i<$this->codeNum;$i++)
  47:         {
  48:             $char = $code{rand(0,strlen($code) - 1)};
  49:             $this->checkCode .= $char;
  50:             $fontColor = imagecolorallocate($this->image, rand(0,128), rand(0,128),rand(0,128));
  51:             $fontSize = rand(3,5);
  52:             $x = rand(0,$this->width-imagefontwidth($fontSize));
  53:             $y = rand(0,$this->height-imagefontheight($fontSize));
  54:             imagechar($this->image, $fontSize, $x, $y, $char, $fontColor);
  55:         }
  56:     }
  57:     /*内部私有方法设置干扰元素*/
  58:     private function setDisturbColor()
  59:     {
  60:         /*绘制干扰点*/
  61:         for($i=0; $i<$this->pixNum; $i++)
  62:         {
  63:             $color = imagecolorallocate($this->image, rand(0,255), rand(0,255), rand(0,255));
  64:             imagesetpixel($this->image, rand(1,$this->width-2), rand(1,$this->height-2), $color);
  65:         }
  66:         /*绘制干扰线*/
  67:         for($i=0; $i<$this->lineNum; $i++)
  68:         {
  69:             $color = imagecolorallocate($this->image, rand(0,255), rand(0,255), rand(0,255));

70: imageline($this->image, rand(1,$this->width / 2), rand(1,$this->height / 2),

rand($this->width / 2,$this->width – 2), rand($this->height / 2,$this->height – 2), $color);

  71:         }
  72:     }
  73:     /*开启session保存 利用echo 
输出图像*/
  74:     function __toString()
  75:     {
  76:         $_SESSION['code'] = strtoupper($this->checkCode);
  77:         $this->getCreateImage();
  78:         $this->createCheckCode();
  79:         $this->setDisturbColor();
  80:         $this->outputImg();
  81:     }
  82:     /*内部私有方法
输出图像*/
  83:     private function outputImg()
  84:     {
  85:         header("content-type:image/png");
  86:         imagepng($this->image);
  87:     }
  88:     /*析构方法,释放对象*/
  89:     function __destruct()
  90:     {
  91:         imagedestroy($this->image);
  92:     }
  93: }
  94: ?>

imgcode.php输出图像

   1: 
   2: session_start();
   3: require_once('myvcode.class.php');
   4: echo new Vcode();
   5: ?>

test.html:同过img标签引用

   1: <img src="imgcode.php">

可以加一个a标签,用js实现换一张效果:

/*局部刷新换验证码*/
function changeCode()
{
	var imgcode = document.getElementById('code');
	var change = document.getElementById('change');
	change.onclick = function()
	{
		/*必须加后面的参数才能刷新*/
		imgcode.src='code.php?tm'+Math.random();
	}
}


code和change分别是img和a的id


PHP验证码制作的问题

很简单,你用[pic]时PHP会检查是否有一个名为pic的常量。这肯定找不到,于是它就在文件开头输出一个警告信息。此信息在图片数据前输出,导致图片无法被浏览器识别。解决方法是给pic加引号,$_SESSION['pic']
 

php图片验证码实现

  可以用php的GD库做

  //随机生成验证码
  class randomString
  {

  function createRandomStr($strLen)
  {
  list($usec, $sec) = explode(' ', microtime());
  (float) $sec + ((float) $usec * 100000);

  $number = '';
  $number_len = $strLen;
  $stuff = '1234567890abcdefghijklmnopqrstuvwxyz';//附加码显示范围ABCDEFGHIJKLMNOPQRSTUVWXYZ
  $stuff_len = strlen($stuff) - 1;
  for ($i = 0; $i < $number_len; $i++) {
  $number .= substr($stuff, mt_rand(0, $stuff_len), 1);
  }
  return $number;
  }
  }
  通过ZD库将验证码变成图片
  $number = $createStr->createRandomStr('4');//验证码的位数
  $number_len = strlen($number);
  $_SESSION["VERIFY_CODE"] = $number;

  // 生成验证码图片
  $img_width = 60;
  $img_height = 20;

  $img = imageCreate($img_width, $img_height);
  ImageColorAllocate($img, 0x6C, 0x74, 0x70);
  $white = ImageColorAllocate($img, 0xff, 0xff, 0xff);

  $ix = 6;
  $iy = 2;
  for ($i = 0; $i < $number_len; $i++) {
  imageString($img, 5, $ix, $iy, $number[$i], $white);
  $ix += 14;
  }
  for($i=0;$i<200;$i++) //加入干扰象素
  {
  $randcolor = ImageColorallocate($img,rand(0,255),rand(0,255),rand(0,255));
  imagesetpixel($img, rand()%100 , rand()%50 , $randcolor);
  }

  // 输出图片
  header("Content-type: " . image_type_to_mime_type(IMAGETYPE_PNG));

  imagepng($img);
  imagedestroy($img);...余下全文>>
 

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