How to use eAccelerator to speed up PHP code_PHP Tutorial
eAccelerator is really a good thing (its predecessor is truck-mmcache).
Simply speaking, it is a caching system that operates with PHP (supports PHP5), exchanging data through shared memory or disk files.
It is widely used to "encode" PHP source code (less appropriately called "encryption") and cache the intermediate code executed by PHP to speed up. There are many and detailed articles about the installation and use of eA. What I would like to recommend this time is to use it to assist in program design caching. It provides a set of APIs as follows:
is a very convenient and stable The local cache implementation method. At present, this part of the design seems to only support shared memory, so it can only be used for Unix-Like OS. Windows is not so lucky.
1. eaccelerator_put($key, $value, $ttl=0)
Store $value into the cache with $key as the key name (object type is supported under php4. Looking at the source code, it seems that it is not available in zend2 Supported), $ttl is the life cycle of this cache, the unit is seconds, omitting this parameter or specifying it as 0 means no time limit, until the server is restarted and cleared.
2. eaccelerator_get($key)
Returns the corresponding data stored in eaccelerator_put() from the cache according to $key. If the cache has expired or does not exist, the return value is NULL
3. eaccelerator_rm($key)
Remove cache based on $key
4. eaccelerator_gc()
Remove and clean up all expired keys
5. eaccelerator_lock ($key)
Add a locking operation to $key to ensure data synchronization during multi-process and multi-thread operations. You need to call eaccelerator_unlock($key) to release the lock or wait for the program to automatically release the lock when the request ends.
For example:
eaccelerator_lock("count");
eaccelerator_put("count",eaccelerator_get("count")+1));
?>
6. eaccelerator_unlock($key)
Release the lock based on $key
7. eaccelerator_cache_output($key, $eval_code, $ttl=0)
Cache the output of the $eval_code code $ttl seconds, (the $ttl parameter is the same as eacclerator_put)
For Example:
8. eaccelerator_cache_result($key, $eval_code, $ttl=0)
Cache the execution result of $eval_code code for $ttl seconds, ($ttl parameter is the same as eacclerator_put), similar to cache_output
For Example:
9. eaccelerator_cache_page($key, $ttl=0)
Cache the current entire page for $ttl seconds.
For Example:
eaccelerator_cache_page($_SERVER['PHP_SELF'].'?GET='.serialize($_GET),30);
echo time();
phpinfo();
?>
10. eaccelerator_rm_page($key)
Delete the cache executed by eaccelerator_cache_page(), the parameter is also $key
______________________________________________
(A simple example to see its power, please note that it may not work in cli mode!)
/n"; } function func() { echo ', the world!'; } function now($t) { echo date('Y-m-d H:i:s', $t); }}$tt = eaccelerator_get("test_tt");if (!$tt){ $tt = new test_cache; eaccelerator_put("test_tt", $tt); echo "no cached!
/n";}else { echo "cached
/n";}echo $tt->pro; $tt->func();$tt->now(time() + 86400);?>

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.

To protect the application from session-related XSS attacks, the following measures are required: 1. Set the HttpOnly and Secure flags to protect the session cookies. 2. Export codes for all user inputs. 3. Implement content security policy (CSP) to limit script sources. Through these policies, session-related XSS attacks can be effectively protected and user data can be ensured.

Methods to optimize PHP session performance include: 1. Delay session start, 2. Use database to store sessions, 3. Compress session data, 4. Manage session life cycle, and 5. Implement session sharing. These strategies can significantly improve the efficiency of applications in high concurrency environments.

Thesession.gc_maxlifetimesettinginPHPdeterminesthelifespanofsessiondata,setinseconds.1)It'sconfiguredinphp.iniorviaini_set().2)Abalanceisneededtoavoidperformanceissuesandunexpectedlogouts.3)PHP'sgarbagecollectionisprobabilistic,influencedbygc_probabi

In PHP, you can use the session_name() function to configure the session name. The specific steps are as follows: 1. Use the session_name() function to set the session name, such as session_name("my_session"). 2. After setting the session name, call session_start() to start the session. Configuring session names can avoid session data conflicts between multiple applications and enhance security, but pay attention to the uniqueness, security, length and setting timing of session names.


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