


How to intercept string function in php (without interrupting words)_PHP tutorial
In the project, I encountered a requirement. For example, I want to intercept a string of characters, but I don’t want to intercept half of the words. I looked at the mb_strimwidth() function in the PHP manual. It is said that it will not interrupt. Word, but the test was not successful, so I wrote it myself first. Although there were some minor problems, it was barely usable. I will encapsulate it better when I have time. The implementation principle of this function is to use wordwrap() to interrupt the word, and then use mb_strlen() calculates the length of the word and intercepts it to the length that needs to be intercepted. The following test:
//Original string
$str = 'readonly this boolean attribute indicates that the user cannot modify the value of the control. Unlike the disabled attribute, the readonly attribute does not prevent the user from clicking or selecting in the control. long ge blog's The value of a read-only control is still submitted with the form.';
echo wordcut($str,100);
//Result:
readonly this boolean attribute indicates that the user cannot modify value of control. Unlike disabled attribute, …
/ **
* This function intercepts English strings and does not interrupt English words, that is, it does not cut half of a word
* note: It is not applicable to Chinese, but of course it can be modified
* note: Currently This function has a small bug. $cutlength does not refer to the length, but the calculation stops when the length of all words reaches this number. In fact, the length of spaces is ignored
*/
function wordcut($string, $cutlength = 250, $replace = '...'){
//If the length is insufficient, return directly
if(mb_strlen($string) return $string;
}else{
//Calculate the total length of the current word
$totalLength = 0;
$datas = $newwords = array();
//Disorganize the text
$wrap = wordwrap($string,1,"t");
//Create an array
$wraps = explode("t",$wrap);
foreach ($wraps as $tmp){
//Calculate the length of each word
$datas[$tmp] = mb_strlen($tmp);
}
foreach ($ datas as $word => $length){
//Save the total length of the word
$totalLength += $length;
//If it is less than the intercepted length, save it
if($totalLength array_push($newwords,$word);
}else{
break;
}
}
//Generate new string
$ str = trim(implode(" ",$newwords));
return empty($str) ? $str : $str.' '.$replace;
}
}
Source of this article: http://www.52blogger.com/archives/819

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.


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

VSCode Windows 64-bit Download
A free and powerful IDE editor launched by Microsoft

Atom editor mac version download
The most popular open source editor

EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function

Dreamweaver CS6
Visual web development tools

SublimeText3 English version
Recommended: Win version, supports code prompts!
