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@admin   请问是这个吗？

<?php

namespace Plugin;

class ValidateCode {

 private $charset = 'abcdefghkmnprstuvwxyzABCDEFGHKMNPRSTUVWXYZ23456789';//随机因子

 private $code;//验证码

 private $codelen = 4;//验证码长度

 private $width = 130;//宽度

 private $height = 50;//高度

 private $img;//图形资源句柄

 private $font;//指定的字体

 private $fontsize = 20;//指定字体大小

 private $fontcolor;//指定字体颜色

 //构造方法初始化

 public function __construct() {

  $this->font = dirname(__FILE__).'/font/Elephant.ttf';//注意字体路径要写对，否则显示不了图片

 }

 //生成随机码

 private function createCode() {

  $_len = strlen($this->charset)-1;

  for ($i=0;$i<$this->codelen;$i++) {

   $this->code .= $this->charset[mt_rand(0,$_len)];

  }

 }

 //生成背景

 private function createBg() {

  $this->img = imagecreatetruecolor($this->width, $this->height);

  $color = imagecolorallocate($this->img, mt_rand(157,255), mt_rand(157,255), mt_rand(157,255));

  imagefilledrectangle($this->img,0,$this->height,$this->width,0,$color);

 }

 //生成文字

 private function createFont() {

  $_x = $this->width / $this->codelen;

  for ($i=0;$i<$this->codelen;$i++) {

   $this->fontcolor = imagecolorallocate($this->img,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156));

   imagettftext($this->img,$this->fontsize,mt_rand(-30,30),$_x*$i+mt_rand(1,5),$this->height / 1.4,$this->fontcolor,$this->font,$this->code[$i]);

  }

 }

 //生成线条、雪花

 private function createLine() {

  //线条

  for ($i=0;$i<6;$i++) {

   $color = imagecolorallocate($this->img,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156));

   imageline($this->img,mt_rand(0,$this->width),mt_rand(0,$this->height),mt_rand(0,$this->width),mt_rand(0,$this->height),$color);

  }

  //雪花

  for ($i=0;$i<100;$i++) {

   $color = imagecolorallocate($this->img,mt_rand(200,255),mt_rand(200,255),mt_rand(200,255));

   imagestring($this->img,mt_rand(1,5),mt_rand(0,$this->width),mt_rand(0,$this->height),'*',$color);

  }

 }

 //输出

 private function outPut() {

  header('Content-type:image/png');

  imagepng($this->img);

  imagedestroy($this->img);

 }

 //对外生成

 public function doimg() {

  $this->createBg();

  $this->createCode();

  $this->createLine();

  $this->createFont();

  $this->outPut();

 }

 //获取验证码

 public function getCode() {

  return strtolower($this->code);

 }

}