把GD库封装进类里面了,但不知道在那里出错了,
请有空滴大牛们帮忙看看,小弟感激不尽,谢谢
找了两天都没找到那里错了,图片还是显示不了,
如:
(先写了个表单biaodan.php)
nbsp;HTML>
(然后封装了个类vcode.class.php)
class Vcode{
private $width; //宽
private $height;//高
private $num; //数量
private $code;//验证码
private $img; //图像的资源
//构造方法, 三个参数
function __construct($width,$height,$num){
$this->width=$width;
$this->height=$height;
$this->num=$num;
$this->code=$this->gocode();//调用自己的方法
}
//获取字符的验证码, 用于保存在服务器中
function getcode(){
return $this->code;
}
//输出图像
function outimg(){
//创建背景 (颜色, 大小, 边框)
$this->createback();
//输出图像
$this->printimg();
}
//创建背景
private function createback(){
//创建资源
$this->img=imagecreatetruecolor($this->width,$htis->height);
//设置随机颜色
$bgcolor=imagecolorallocate($this->img,rand(225,255),rand(225,255),rand(225,255));
//设置背景填充
imagefill($this->img,0,0,$bgcolor);
//画边框
$bordercolor=imagecolorallocate($this->img,0,0,0);
imagerectangle($this->img,0,0,$this->width-1,$this->height-1,$bordercolor);
}
//画字
private function outstring(){
}
//设置干扰元素
private function grcode(){
}
//输出图像
private function printimg(){
if(imagetypes() & IMG_GIF){
header("Content-type:image/gif");
imagegif($this->img);
}else if(imagetypes() & IMG_JPG){
header("Content-type:image/jpeg");
imagejpeg($this->img);
}else if(imagetypes() & IMG_PNG){
header("Content-type:image/png");
imagepng($this->img);
}else{
die("No image support in this PHP server");
}
}
//生成验证码字符串
private function gocode(){
$codes = "3456789abcdefghijkmnpqrstuvwxyABCDEFGHIJKLMNPQRSTUVWXY";
$code= "";
for($i=0;$inum;$i++){
$code.=$codes{rand(0,strlen($codes)-1)};
}
return $code;
}
//用于自动销毁图像资源
function __destruct(){
imagedestroy($this->img);
}
}
(在调用类code.php)
//开启session
session_start();
include "vcode.class.php";
//构造方法
$vcode= new Vcode(80,25,4);
//将验证码放到服务器自己的空间保存一份
$_SESSION=$vcode->getcode();
//将验证码图片输出
$vcode->outimg();
回复讨论(解决方案)
你在浏览器地址栏输入code.php看看,看能不能生成验证码的图片
貌似也没看见你将数字写入画布上啊
写不好还是去网上找个能用的吧 晚上资源那么多
//创建资源 $this->img=imagecreatetruecolor($this->width,$htis->height);
//创建资源
$this->img=imagecreatetruecolor($this->width,$ htis->height);

Reasons for PHPSession failure include configuration errors, cookie issues, and session expiration. 1. Configuration error: Check and set the correct session.save_path. 2.Cookie problem: Make sure the cookie is set correctly. 3.Session expires: Adjust session.gc_maxlifetime value to extend session time.

Methods to debug session problems in PHP include: 1. Check whether the session is started correctly; 2. Verify the delivery of the session ID; 3. Check the storage and reading of session data; 4. Check the server configuration. By outputting session ID and data, viewing session file content, etc., you can effectively diagnose and solve session-related problems.

Multiple calls to session_start() will result in warning messages and possible data overwrites. 1) PHP will issue a warning, prompting that the session has been started. 2) It may cause unexpected overwriting of session data. 3) Use session_status() to check the session status to avoid repeated calls.

Configuring the session lifecycle in PHP can be achieved by setting session.gc_maxlifetime and session.cookie_lifetime. 1) session.gc_maxlifetime controls the survival time of server-side session data, 2) session.cookie_lifetime controls the life cycle of client cookies. When set to 0, the cookie expires when the browser is closed.

The main advantages of using database storage sessions include persistence, scalability, and security. 1. Persistence: Even if the server restarts, the session data can remain unchanged. 2. Scalability: Applicable to distributed systems, ensuring that session data is synchronized between multiple servers. 3. Security: The database provides encrypted storage to protect sensitive information.

Implementing custom session processing in PHP can be done by implementing the SessionHandlerInterface interface. The specific steps include: 1) Creating a class that implements SessionHandlerInterface, such as CustomSessionHandler; 2) Rewriting methods in the interface (such as open, close, read, write, destroy, gc) to define the life cycle and storage method of session data; 3) Register a custom session processor in a PHP script and start the session. This allows data to be stored in media such as MySQL and Redis to improve performance, security and scalability.

SessionID is a mechanism used in web applications to track user session status. 1. It is a randomly generated string used to maintain user's identity information during multiple interactions between the user and the server. 2. The server generates and sends it to the client through cookies or URL parameters to help identify and associate these requests in multiple requests of the user. 3. Generation usually uses random algorithms to ensure uniqueness and unpredictability. 4. In actual development, in-memory databases such as Redis can be used to store session data to improve performance and security.

Managing sessions in stateless environments such as APIs can be achieved by using JWT or cookies. 1. JWT is suitable for statelessness and scalability, but it is large in size when it comes to big data. 2.Cookies are more traditional and easy to implement, but they need to be configured with caution to ensure security.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool

SublimeText3 Chinese version
Chinese version, very easy to use

MantisBT
Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.

Atom editor mac version download
The most popular open source editor
