


Why is all the field information cleared after I click the browser's back button? _PHP Tutorial
Q: Why is the information in all fields cleared after I click the browser's back button?
A: This is because you used the session_start function in your form submission page. This function will force the current page to not be cached. The solution is to add header("Cache-control: private"); after your Session_start function; Note that your PHP program cannot have any output before this line.

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Sesame Open Door is a platform that focuses on cryptocurrency trading. Users can obtain portals through official websites or social media to ensure that the authenticity of SSL certificates and website content is verified during access.

Choose a reliable trading platform such as OKEx to ensure access to the official entrance.

Visit Binance official website and check HTTPS and green lock logos to avoid phishing websites, and official applications can also be accessed safely.

The main differences between Laravel and Yii are design concepts, functional characteristics and usage scenarios. 1.Laravel focuses on the simplicity and pleasure of development, and provides rich functions such as EloquentORM and Artisan tools, suitable for rapid development and beginners. 2.Yii emphasizes performance and efficiency, is suitable for high-load applications, and provides efficient ActiveRecord and cache systems, but has a steep learning curve.

In MySQL, add fields using ALTERTABLEtable_nameADDCOLUMNnew_columnVARCHAR(255)AFTERexisting_column, delete fields using ALTERTABLEtable_nameDROPCOLUMNcolumn_to_drop. When adding fields, you need to specify a location to optimize query performance and data structure; before deleting fields, you need to confirm that the operation is irreversible; modifying table structure using online DDL, backup data, test environment, and low-load time periods is performance optimization and best practice.

C is suitable for processing sensor data due to its high performance and low-level control capabilities. Specific steps include: 1. Data collection: Obtain data through the hardware interface. 2. Data analysis: convert the original data into available information. 3. Data processing: filtering and smoothing processing. 4. Data storage: Save data to a file or database. 5. Real-time processing: Ensure the efficient and low latency of the code.

Uniswap users can withdraw tokens from liquidity pools to their wallets to ensure asset security and liquidity. The process requires gas fees and is affected by network congestion.

Building a live chat application in Laravel requires using WebSocket and Pusher. The specific steps include: 1) Configure Pusher information in the .env file; 2) Set the broadcasting driver in the broadcasting.php file to Pusher; 3) Subscribe to the Pusher channel and listen to events using LaravelEcho; 4) Send messages through Pusher API; 5) Implement private channel and user authentication; 6) Perform performance optimization and debugging.
