本文实例讲述了thinkPHP中验证码的简单实现方法。分享给大家供大家参考，具体如下：
运行效果图如下：
http://files.jb51.net/file_images/article/201612/201612594036120.png?201611594110
1.php端生成验证码函数
public function verify(){
// 验证码
import("@.Util.Image");
Image::buildImageVerify(4,1,'png',40,20,'verify');
}
/**
* 生成图像验证码
* @static
* @access public
* @param string $length 位数
* @param string $mode 类型
* @param string $type 图像格式
* @param string $width 宽度
* @param string $height 高度
* @return string
*/
static function buildImageVerify($length=4, $mode=1, $type='png', $width=48, $height=22, $verifyName='verify') {
import('ORG.Util.String');
$randval = String::randString($length, $mode);
session($verifyName, md5($randval));
$width = ($length * 10 + 10) > $width ? $length * 10 + 10 : $width;
if ($type != 'gif' && function_exists('imagecreatetruecolor')) {
$im = imagecreatetruecolor($width, $height);
} else {
$im = imagecreate($width, $height);
}
$r = Array(225, 255, 255, 223);
$g = Array(225, 236, 237, 255);
$b = Array(225, 236, 166, 125);
$key = mt_rand(0, 3);
$backColor = imagecolorallocate($im, $r[$key], $g[$key], $b[$key]);//背景色（随机）
$borderColor = imagecolorallocate($im, 100, 100, 100); //边框色
imagefilledrectangle($im, 0, 0, $width - 1, $height - 1, $backColor);
imagerectangle($im, 0, 0, $width - 1, $height - 1, $borderColor);
$stringColor = imagecolorallocate($im, mt_rand(0, 200), mt_rand(0, 120), mt_rand(0, 120));
// 干扰
for ($i = 0; $i
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