验证码无法显示，〜求大神看看

qq_22213143 2014-10-20 01:55:17

<?php
//验证码类
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 = ROOT_PATH.'/font/elephant.ttf';
}

//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() {
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);
}
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);
}
}
?>

单独建一个文件显示是正常的，放到mvc模式下的方法中显示图片就xx了。
正常的:
<?php
define('ROOT_PATH', dirname(__FILE__));
require './core/ValidateCode.class.php'; //先把类包含进来，实际路径根据实际情况进行修改。
$_vc = new ValidateCode(); //实例化一个对象
$_vc->doimg();
$_SESSION['code'] = $_vc->getCode();//验证码保存到SESSION中
?>

显示x的:
<?php

class UsersController extends Controller {

public function login(){
$this->smarty->display( 'login.html' );
}

public function verifi(){
$_vc = new ValidateCode(); //实例化一个对象
$_vc->doimg();
//$_SESSION['code'] = $_vc->getCode();//验证码保存到SESSION中
}

}

?>

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