效果：

myvcode.class.php：封裝創(chuàng)建驗證碼的類

<?php
/*
* file:myvcode.class.php
* 驗證碼類,類名Vcode
*/
class Vcode
{
private $width;              /*驗證碼寬度*/
private $height;             /*驗證碼高度*/
private $codeNum;            /*驗證碼字符個數(shù)*/
private $checkCode;            /*驗證碼字符*/
private $image;                /*驗證碼資源*/
private $pixNum;            /*繪制干擾點的個數(shù)*/
private $lineNum;            /*繪制干擾線的條數(shù)*/

/*
*構(gòu)造方法實例化驗證碼對象，并初始化數(shù)據(jù)
*@param int $width         設(shè)置默認(rèn)寬度
*@param int $height     設(shè)置默認(rèn)高度
*@param int $codeNum    設(shè)置驗證碼中的字符個數(shù)
*@param int $pixNum        設(shè)置干擾點的個數(shù)
*@param int $lineNum    設(shè)置干擾線的數(shù)量
*/
function __construct($width=80,$height=40,$codeNum=4,$pixNum=40,$lineNum=5)
{
$this->width = $width;
$this->height = $height;
$this->codeNum = $codeNum;
$this->pixNum = $pixNum;
$this->lineNum = $lineNum;
}
/*內(nèi)部私有方法,創(chuàng)建圖像資源*/
private function getCreateImage()
{
$this->image = imagecreatetruecolor($this->width, $this->height);
$white = imagecolorallocate($this->image,0xff,0xff,0xff);
imagefill($this->image, 0, 0, $white);
$black = imagecolorallocate($this->image,0,0,0);
imagerectangle($this->image, 0, 0, $this->width-1, $this->height-1, $black);
}
/*內(nèi)部私有方法,繪制字符，去掉o0Llz和012*/
private function createCheckCode()
{
$code = '3456789abcdefghijkmnpqrstuvwxyABCDEFGHIJKMNPQRSTUVWXY';
$this->checkCode = "";
for($i=0; $i<$this->codeNum;$i++)
{
$char = $code{rand(0,strlen($code) - 1)};
$this->checkCode .= $char;
$fontColor = imagecolorallocate($this->image, rand(0,128), rand(0,128),rand(0,128));
$fontSize = rand(3,5);
$x = rand(0,$this->width-imagefontwidth($fontSize));
$y = rand(0,$this->height-imagefontheight($fontSize));
imagechar($this->image, $fontSize, $x, $y, $char, $fontColor);
}
}
/*內(nèi)部私有方法設(shè)置干擾元素*/
private function setDisturbColor()
{
/*繪制干擾點*/
for($i=0; $i<$this->pixNum; $i++)
{
$color = imagecolorallocate($this->image, rand(0,255), rand(0,255), rand(0,255));
imagesetpixel($this->image, rand(1,$this->width-2), rand(1,$this->height-2), $color);
}
/*繪制干擾線*/
for($i=0; $i<$this->lineNum; $i++)
{
$color = imagecolorallocate($this->image, rand(0,255), rand(0,255), rand(0,255));
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);

}
}
/*開啟session保存 利用echo 輸出圖像*/
function __toString()
{
$_SESSION['code'] = strtoupper($this->checkCode);
$this->getCreateImage();
$this->createCheckCode();
$this->setDisturbColor();
$this->outputImg();
}
/*內(nèi)部私有方法輸出圖像*/
private function outputImg()
{
header("content-type:image/png");
imagepng($this->image);
}
/*析構(gòu)方法，釋放對象*/
function __destruct()
{
imagedestroy($this->image);
}
}
?>

imgcode.php輸出圖像

<?php
session_start();
require_once('myvcode.class.php');
echo new Vcode();
?>

test.html:同過img標(biāo)簽引用

<img src="imgcode.php">

可以加一個a標(biāo)簽，用js實現(xiàn)換一張效果：

/*局部刷新?lián)Q驗證碼*/
function changeCode()
{
var imgcode = document.getElementById(‘code');
var change = document.getElementById(‘change');
change.onclick = function()
{
/*必須加后面的參數(shù)才能刷新*/
imgcode.src='code.php?tm'+Math.random();
}
}

code和change分別是img和a的id

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