标头 缓存
Warning: Cannot modify header information - headers already sent by (output started at E:\AppServ\www\php_cs_wenjian\yingp\qbzy.php:23) in E:\AppServ\www\php_cs_wenjian\yingp\includes\hanshu.php on line 333这个问题以前遇过解决了用的是排除一点点的搞!这次代码很好找不出问题而且关系到很多函数所以想请教大手们给个方法!听说缓存技术可以解决!谁知道吗?我没用过缓存、
回复讨论(解决方案)
代码中两次调用了 设置header的 函数,两次调用很可能都是header()
代码中两次调用了 设置header的 函数,两次调用很可能都是header()
我只是写一个简单的判断类然后生成cookie!
是否之前有输出,比如空行。文件编码是否一致。
文件前有没有输出?
还有一个可能。BOM头
是否之前有输出,比如空行。文件编码是否一致。
是输出到浏览器还是怎么输出、我把判断放在函数集里面的、然后调用函数集到用的页面上、还用那个空行是什么意思?
具体还是要你贴出代码。
具体还是要你贴出代码。
这个又两个函数页面一个数据库页面一个出问题的页面!四个页面的代码有七八百行怎么贴啊
具体还是要你贴出代码。
class goow{
public $han = "<script>window.onload = function(){boxs(1);}</script>";
function cshu($czhi){
echo $this->han;
$this->scuo = "
}
}
class goow_cd extends goow{
private $_char_pattern = '/[\|\'\$\"\ ]/';
function d($user,$pass){
if ($user == ''){
$this->cshu('用户名不得为空');
return false;
}
$this->user = $user;
if ($pass == ''){
$this->cshu('密码不得为空');
return false;
}
if (10 $this->cshu('用户名不得少于2位或大于10位');
return false;
}
if (preg_match($this->_char_pattern,$user)) {
$this->cshu('用户名不得包含敏感字符');
return false;
}
if (16 $this->cshu('密码不得少于6位或大于10位');
return false;
}
$pass = sha1(md5($pass));
$this->pass = $pass;
if (!my_shuz("select user from user where user = '$user' LIMIT 1")){
$this->cshu('没有此用户');
return false;
}
if (!my_shuz("select pass from user where pass = '$pass' LIMIT 1")){
$this->cshu('用户或密码错误');
return false;
}
if (!my_shuz("select zyuip from user where zyuip = '' and user = '$user' LIMIT 1")){
$this->cshu('该帐号还未激活');
return false;
}
setcookie("UserName",$user);
}
}
这是类
session_start();
define('IN_TG',true);
require substr(dirname(__FILE__),0,-6).'/yingp/includes/hanshu.php';
if ($_GET['shouid'] != ''){
q_mysql();
$p_xiangx = pduan_f("select * from product where p_id = '{$_GET['shouid']}'",'没有此商品');
}else{
tangc('没有此类商品');
}
$p_zp = array_filter(split(',',$p_xiangx['p_zp']));
$p_dx = array_filter(split(',',$p_xiangx['p_dx']));
$p_zps = count($p_zp);
echo "<script></script>";
if ($_GET['shul'] != '' && $_GET['hm'] != ''){
if($_POST['d_tj'] != ''){
$user = trim($_POST['user']);
$pass = trim($_POST['pass']);
$czhi = new goow_cd();
$czhi->d($user,$pass);
}else{
tangc('非法提交!');
}
}
?>
这个是我调用页面的头部php
具体还是要你贴出代码。
以前输出cookie的时候就没问题!应该就是这两句代码的问题!

PHP is a server-side scripting language used for dynamic web development and server-side applications. 1.PHP is an interpreted language that does not require compilation and is suitable for rapid development. 2. PHP code is embedded in HTML, making it easy to develop web pages. 3. PHP processes server-side logic, generates HTML output, and supports user interaction and data processing. 4. PHP can interact with the database, process form submission, and execute server-side tasks.

PHP has shaped the network over the past few decades and will continue to play an important role in web development. 1) PHP originated in 1994 and has become the first choice for developers due to its ease of use and seamless integration with MySQL. 2) Its core functions include generating dynamic content and integrating with the database, allowing the website to be updated in real time and displayed in personalized manner. 3) The wide application and ecosystem of PHP have driven its long-term impact, but it also faces version updates and security challenges. 4) Performance improvements in recent years, such as the release of PHP7, enable it to compete with modern languages. 5) In the future, PHP needs to deal with new challenges such as containerization and microservices, but its flexibility and active community make it adaptable.

The core benefits of PHP include ease of learning, strong web development support, rich libraries and frameworks, high performance and scalability, cross-platform compatibility, and cost-effectiveness. 1) Easy to learn and use, suitable for beginners; 2) Good integration with web servers and supports multiple databases; 3) Have powerful frameworks such as Laravel; 4) High performance can be achieved through optimization; 5) Support multiple operating systems; 6) Open source to reduce development costs.

PHP is not dead. 1) The PHP community actively solves performance and security issues, and PHP7.x improves performance. 2) PHP is suitable for modern web development and is widely used in large websites. 3) PHP is easy to learn and the server performs well, but the type system is not as strict as static languages. 4) PHP is still important in the fields of content management and e-commerce, and the ecosystem continues to evolve. 5) Optimize performance through OPcache and APC, and use OOP and design patterns to improve code quality.

PHP and Python have their own advantages and disadvantages, and the choice depends on the project requirements. 1) PHP is suitable for web development, easy to learn, rich community resources, but the syntax is not modern enough, and performance and security need to be paid attention to. 2) Python is suitable for data science and machine learning, with concise syntax and easy to learn, but there are bottlenecks in execution speed and memory management.

PHP is used to build dynamic websites, and its core functions include: 1. Generate dynamic content and generate web pages in real time by connecting with the database; 2. Process user interaction and form submissions, verify inputs and respond to operations; 3. Manage sessions and user authentication to provide a personalized experience; 4. Optimize performance and follow best practices to improve website efficiency and security.

PHP uses MySQLi and PDO extensions to interact in database operations and server-side logic processing, and processes server-side logic through functions such as session management. 1) Use MySQLi or PDO to connect to the database and execute SQL queries. 2) Handle HTTP requests and user status through session management and other functions. 3) Use transactions to ensure the atomicity of database operations. 4) Prevent SQL injection, use exception handling and closing connections for debugging. 5) Optimize performance through indexing and cache, write highly readable code and perform error handling.

Using preprocessing statements and PDO in PHP can effectively prevent SQL injection attacks. 1) Use PDO to connect to the database and set the error mode. 2) Create preprocessing statements through the prepare method and pass data using placeholders and execute methods. 3) Process query results and ensure the security and performance of the code.


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