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PHP制作验证码

2020-03-22 20:24:53
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  • html' target='_blank'>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: <?php
       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: <?php
       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编程

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