php用正则表达式截取字符【求助】
哪位高手帮忙看看：我想从下面的代码中提取
{dede:field name='keywords'}{/dede:field}
{dede:field name='description'}{/dede:field}
{dede:field name='title'}http://down.sucai.com/fonts/soft/071130/1_071204075903.rar{/dede:field}
{dede:field name='writer'}{/dede:field}
{dede:field name='source'}{/dede:field}
{dede:field name='body'}{/dede:field}
{dede:field name='pubdate'}{/dede:field}
{dede:field name='litpic'}/uploads/allimg/c100112/12632b9420Z-412413.jpg{/dede:field}
这个
http://down.sucai.com/fonts/soft/071130/1_071204075903.rar
和
/uploads/allimg/c100112/12632b9420Z-412413.jpg
正则应该怎么来写呢
------解决方案--------------------
- PHP code
<br> $str = {dede:field name='keywords'}{/dede:field} <br> {dede:field name='description'}{/dede:field} <br> {dede:field name='title'}http://down.sucai.com/fonts/soft/071130/1_071204075903.rar{/dede:field} <br> {dede:field name='writer'}{/dede:field} <br> {dede:field name='source'}{/dede:field} <br> {dede:field name='body'}{/dede:field} <br> {dede:field name='pubdate'}{/dede:field} <br> {dede:field name='litpic'}/uploads/allimg/c100112/12632b9420Z-412413.jpg{/dede:field} <br> EOF; <br> <br> preg_match_all("#name='(title|litpic)'\}(.*)\{#U",$str,$matches); <br> <br> print_r($matches); <br>
------解决方案--------------------
$s = {dede:field name='keywords'}{/dede:field}
{dede:field name='description'}{/dede:field}
{dede:field name='title'}http://down.sucai.com/fonts/soft/071130/1_071204075903.rar{/dede:field}
{dede:field name='writer'}{/dede:field}
{dede:field name='source'}{/dede:field}
{dede:field name='body'}{/dede:field}
{dede:field name='pubdate'}{/dede:field}
{dede:field name='litpic'}/uploads/allimg/c100112/12632b9420Z-412413.jpg{/dede:field}
HTML;
$p = '#}(.+){#';
preg_match_all($p, $s, $r);
print_r($r[1]);
Array
(
[0] => http://down.sucai.com/fonts/soft/071130/1_071204075903.rar
[1] => /uploads/allimg/c100112/12632b9420Z-412413.jpg
)
What are some common problems that can cause PHP sessions to fail?Apr 25, 2025 am 12:16 AMReasons 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.
How do you debug session-related issues in PHP?Apr 25, 2025 am 12:12 AMMethods 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.
What happens if session_start() is called multiple times?Apr 25, 2025 am 12:06 AMMultiple 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.
How do you configure the session lifetime in PHP?Apr 25, 2025 am 12:05 AMConfiguring 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.
What are the advantages of using a database to store sessions?Apr 24, 2025 am 12:16 AMThe 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.
How do you implement custom session handling in PHP?Apr 24, 2025 am 12:16 AMImplementing 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.
What is a session ID?Apr 24, 2025 am 12:13 AMSessionID 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.
How do you handle sessions in a stateless environment (e.g., API)?Apr 24, 2025 am 12:12 AMManaging 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
Safe Exam Browser
Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.
PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool
MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.
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.
VSCode Windows 64-bit Download
A free and powerful IDE editor launched by Microsoft
