【PHP】图片验证码

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<?php/* * 图片验证码 *  * Author: DYmyw * Email: dymayongwei@163.com * Date: 2012/03/15 * Version：1.0 */session_start();  $pic = imagecreatetruecolor(50, 22);$gb = imagecolorallocate($pic, 0, 0, 0);  for ($i=1; $i<=50; $i++){$pixelcolor = imagecolorallocate($pic, rand(0, 255), rand(0, 255), rand(0, 255));imagesetpixel($pic, rand(0, 50), rand(0, 22), $pixelcolor);}  for ($i=1; $i<=4; $i++){$verify = dechex(rand(0, 15));$verifystr .= $verify;$verifycolor = imagecolorallocate($pic, rand(175, 255), rand(175, 255), rand(175, 255));imagestring($pic, 6, ($i-1)*10+5, rand(0, 8), $verify, $verifycolor);}$_SESSION['verifystr'] = $verifystr;  header("Content-type: image/png");imagepng($pic);?>

使用说明：

<img name="VerifyPic" src="VerifyPic.php" title="看不清？点击换一张" border="0" onclick="this.src='VerifyPic.php?'+Math.random();" style="cursor:hand;" />