PHP制作图形验证码代码分享_PHP

效果：

myvcode.class.php：封装创建验证码的类

<?php<br />/*<br />* file:myvcode.class.php<br />* 验证码类,类名Vcode<br />*/<br />class Vcode<br />{<br />private $width;              /*验证码宽度*/<br />private $height;             /*验证码高度*/<br />private $codeNum;            /*验证码字符个数*/<br />private $checkCode;            /*验证码字符*/<br />private $image;                /*验证码资源*/<br />private $pixNum;            /*绘制干扰点的个数*/<br />private $lineNum;            /*绘制干扰线的条数*/

/*<br />*构造方法实例化验证码对象，并初始化数据<br />*@param int $width         设置默认宽度<br />*@param int $height     设置默认高度<br />*@param int $codeNum    设置验证码中的字符个数<br />*@param int $pixNum        设置干扰点的个数<br />*@param int $lineNum    设置干扰线的数量<br />*/<br />function __construct($width=80,$height=40,$codeNum=4,$pixNum=40,$lineNum=5)<br />{<br />$this->width = $width;<br />$this->height = $height;<br />$this->codeNum = $codeNum;<br />$this->pixNum = $pixNum;<br />$this->lineNum = $lineNum;<br />}<br />/*内部私有方法,创建图像资源*/<br />private function getCreateImage()<br />{<br />$this->image = imagecreatetruecolor($this->width, $this->height);<br />$white = imagecolorallocate($this->image,0xff,0xff,0xff);<br />imagefill($this->image, 0, 0, $white);<br />$black = imagecolorallocate($this->image,0,0,0);<br />imagerectangle($this->image, 0, 0, $this->width-1, $this->height-1, $black);<br />}<br />/*内部私有方法,绘制字符，去掉o0Llz和012*/<br />private function createCheckCode()<br />{<br />$code = '3456789abcdefghijkmnpqrstuvwxyABCDEFGHIJKMNPQRSTUVWXY';<br />$this->checkCode = "";<br />for($i=0; $icodeNum;$i++)<br />{<br />$char = $code{rand(0,strlen($code) - 1)};<br />$this->checkCode .= $char;<br />$fontColor = imagecolorallocate($this->image, rand(0,128), rand(0,128),rand(0,128));<br />$fontSize = rand(3,5);<br />$x = rand(0,$this->width-imagefontwidth($fontSize));<br />$y = rand(0,$this->height-imagefontheight($fontSize));<br />imagechar($this->image, $fontSize, $x, $y, $char, $fontColor);<br />}<br />}<br />/*内部私有方法设置干扰元素*/<br />private function setDisturbColor()<br />{<br />/*绘制干扰点*/<br />for($i=0; $ipixNum; $i++)<br />{<br />$color = imagecolorallocate($this->image, rand(0,255), rand(0,255), rand(0,255));<br />imagesetpixel($this->image, rand(1,$this->width-2), rand(1,$this->height-2), $color);<br />}<br />/*绘制干扰线*/<br />for($i=0; $ilineNum; $i++)<br />{<br />$color = imagecolorallocate($this->image, rand(0,255), rand(0,255), rand(0,255));<br />imageline($this->image, rand(1,$this->width / 2), rand(1,$this->height / 2),<br />rand($this->width / 2,$this->width – 2), rand($this->height / 2,$this->height – 2), $color);

}<br />}<br />/*开启session保存 利用echo 输出图像*/<br />function __toString()<br />{<br />$_SESSION['code'] = strtoupper($this->checkCode);<br />$this->getCreateImage();<br />$this->createCheckCode();<br />$this->setDisturbColor();<br />$this->outputImg();<br />}<br />/*内部私有方法输出图像*/<br />private function outputImg()<br />{<br />header("content-type:image/png");<br />imagepng($this->image);<br />}<br />/*析构方法，释放对象*/<br />function __destruct()<br />{<br />imagedestroy($this->image);<br />}<br />}<br />?>

imgcode.php输出图像

test.html:同过img标签引用

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.get

搞gaodaima代码

ElementById(‘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

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