ThinkPHP+Smarty模板中截取包含中英文混合的字符串乱码的解决方案
好几天没写博客了，其实有好多需要总结的，因为最近一直在忙着做项目，但是困惑了几天的Smarty模板中截取包含中英文混合的字符串乱码的问题，终于解决了，所以记录下来，需要的朋友看一下：
出现乱码的原因：
对于字符串的截取，truncate函数只适合英文用户，对与中文用户来说，使用 truncate会出现乱码，而且对于中文英文混合串来说，截取同样个数的字符串，实际显示长度上却不同，一个中文的长度大致相当于两个英文的长度。此外，truncate不能同时兼容GB2312、UTF-8等编码。
解决方法：自己写一个扩展类使用
ThinkPHP使用的smarty的truncate变量调节器所在的类文件位置：ThinkPHP\Library\Vendor\Smarty\plugins，其中有一个就是modifier.truncate.php，我们不用这个，我们自己写一个来实现
文件名：modifier.smartTruncate.php
<span style="color: #000000;">php</span><span style="color: #008000;">/*</span><span style="color: #008000;">* * 中英文多编码字符串截取</span><span style="color: #008000;">*/</span><span style="color: #0000ff;">function</span> smartDetectUTF8(<span style="color: #800080;">$string</span><span style="color: #000000;">){ </span><span style="color: #0000ff;">static</span> <span style="color: #800080;">$result</span> = <span style="color: #0000ff;">array</span><span style="color: #000000;">(); </span><span style="color: #0000ff;">if</span>(! <span style="color: #008080;">array_key_exists</span>(<span style="color: #800080;">$key</span> = <span style="color: #008080;">md5</span>(<span style="color: #800080;">$string</span>), <span style="color: #800080;">$result</span><span style="color: #000000;">)) { </span><span style="color: #800080;">$utf8</span> = "<span style="color: #000000;"> /^(?: [\x09\x0A\x0D\x20-\x7E] # ASCII | [\xC2-\xDF][\x80-\xBF] # non-overlong 2-byte | \xE0[\xA0-\xBF][\x80-\xBF] # excluding overlongs | [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2} # straight 3-byte | \xED[\x80-\x9F][\x80-\xBF] # excluding surrogates | \xF0[\x90-\xBF][\x80-\xBF]{2} # planes 1-3 | [\xF1-\xF3][\x80-\xBF]{3} # planes 4-15 | \xF4[\x80-\x8F][\x80-\xBF]{2} # plane 16 )+$/xs </span>"<span style="color: #000000;">; </span><span style="color: #800080;">$result</span>[<span style="color: #800080;">$key</span>] = <span style="color: #008080;">preg_match</span>(<span style="color: #008080;">trim</span>(<span style="color: #800080;">$utf8</span>), <span style="color: #800080;">$string</span><span style="color: #000000;">); } </span><span style="color: #0000ff;">return</span> <span style="color: #800080;">$result</span>[<span style="color: #800080;">$key</span><span style="color: #000000;">];}</span><span style="color: #0000ff;">function</span> smartStrlen(<span style="color: #800080;">$string</span><span style="color: #000000;">){ </span><span style="color: #800080;">$result</span> = 0<span style="color: #000000;">; </span><span style="color: #800080;">$number</span> = smartDetectUTF8(<span style="color: #800080;">$string</span>) ? 3 : 2<span style="color: #000000;">; </span><span style="color: #0000ff;">for</span>(<span style="color: #800080;">$i</span> = 0; <span style="color: #800080;">$i</span> strlen(<span style="color: #800080;">$string</span>); <span style="color: #800080;">$i</span> += <span style="color: #800080;">$bytes</span><span style="color: #000000;">) { </span><span style="color: #800080;">$bytes</span> = <span style="color: #008080;">ord</span>(<span style="color: #008080;">substr</span>(<span style="color: #800080;">$string</span>, <span style="color: #800080;">$i</span>, 1)) > 127 ? <span style="color: #800080;">$number</span> : 1<span style="color: #000000;">; </span><span style="color: #800080;">$result</span> += <span style="color: #800080;">$bytes</span> > 1 ? 1.0 : 0.5<span style="color: #000000;">; } </span><span style="color: #0000ff;">return</span> <span style="color: #800080;">$result</span><span style="color: #000000;">;}</span><span style="color: #0000ff;">function</span> smartSubstr(<span style="color: #800080;">$string</span>, <span style="color: #800080;">$start</span>, <span style="color: #800080;">$length</span> = <span style="color: #0000ff;">null</span><span style="color: #000000;">){ </span><span style="color: #800080;">$result</span> = ''<span style="color: #000000;">; </span><span style="color: #800080;">$number</span> = smartDetectUTF8(<span style="color: #800080;">$string</span>) ? 3 : 2<span style="color: #000000;">; </span><span style="color: #0000ff;">if</span>(<span style="color: #800080;">$start</span> ) { <span style="color: #800080;">$start</span> = <span style="color: #008080;">max</span>(smartStrlen(<span style="color: #800080;">$string</span>) + <span style="color: #800080;">$start</span>, 0<span style="color: #000000;">); } </span><span style="color: #0000ff;">for</span>(<span style="color: #800080;">$i</span> = 0; <span style="color: #800080;">$i</span> strlen(<span style="color: #800080;">$string</span>); <span style="color: #800080;">$i</span> += <span style="color: #800080;">$bytes</span><span style="color: #000000;">) { </span><span style="color: #0000ff;">if</span>(<span style="color: #800080;">$start</span> ) { <span style="color: #0000ff;">break</span><span style="color: #000000;">; } </span><span style="color: #800080;">$bytes</span> = <span style="color: #008080;">ord</span>(<span style="color: #008080;">substr</span>(<span style="color: #800080;">$string</span>, <span style="color: #800080;">$i</span>, 1)) > 127 ? <span style="color: #800080;">$number</span> : 1<span style="color: #000000;">; </span><span style="color: #800080;">$start</span> -= <span style="color: #800080;">$bytes</span> > 1 ? 1.0 : 0.5<span style="color: #000000;">; } </span><span style="color: #0000ff;">if</span>(<span style="color: #008080;">is_null</span>(<span style="color: #800080;">$length</span><span style="color: #000000;">)) { </span><span style="color: #800080;">$result</span> = <span style="color: #008080;">substr</span>(<span style="color: #800080;">$string</span>, <span style="color: #800080;">$i</span><span style="color: #000000;">); } </span><span style="color: #0000ff;">else</span><span style="color: #000000;"> { </span><span style="color: #0000ff;">for</span>(<span style="color: #800080;">$j</span> = <span style="color: #800080;">$i</span>; <span style="color: #800080;">$j</span> strlen(<span style="color: #800080;">$string</span>); <span style="color: #800080;">$j</span> += <span style="color: #800080;">$bytes</span><span style="color: #000000;">) { </span><span style="color: #0000ff;">if</span>(<span style="color: #800080;">$length</span> ) { <span style="color: #0000ff;">break</span><span style="color: #000000;">; } </span><span style="color: #0000ff;">if</span>((<span style="color: #800080;">$bytes</span> = <span style="color: #008080;">ord</span>(<span style="color: #008080;">substr</span>(<span style="color: #800080;">$string</span>, <span style="color: #800080;">$j</span>, 1)) > 127 ? <span style="color: #800080;">$number</span> : 1) > 1<span style="color: #000000;">) { </span><span style="color: #0000ff;">if</span>(<span style="color: #800080;">$length</span> ) { <span style="color: #0000ff;">break</span><span style="color: #000000;">; } </span><span style="color: #800080;">$result</span> .= <span style="color: #008080;">substr</span>(<span style="color: #800080;">$string</span>, <span style="color: #800080;">$j</span>, <span style="color: #800080;">$bytes</span><span style="color: #000000;">); </span><span style="color: #800080;">$length</span> -= 1.0<span style="color: #000000;">; } </span><span style="color: #0000ff;">else</span><span style="color: #000000;"> { </span><span style="color: #800080;">$result</span> .= <span style="color: #008080;">substr</span>(<span style="color: #800080;">$string</span>, <span style="color: #800080;">$j</span>, 1<span style="color: #000000;">); </span><span style="color: #800080;">$length</span> -= 0.5<span style="color: #000000;">; } } } </span><span style="color: #0000ff;">return</span> <span style="color: #800080;">$result</span><span style="color: #000000;">;}</span><span style="color: #0000ff;">function</span> smarty_modifier_smartTruncate(<span style="color: #800080;">$string</span>, <span style="color: #800080;">$length</span> = 80, <span style="color: #800080;">$etc</span> = '...',<span style="color: #800080;">$break_words</span> = <span style="color: #0000ff;">false</span>, <span style="color: #800080;">$middle</span> = <span style="color: #0000ff;">false</span><span style="color: #000000;">){ </span><span style="color: #0000ff;">if</span> (<span style="color: #800080;">$length</span> == 0<span style="color: #000000;">) </span><span style="color: #0000ff;">return</span> ''<span style="color: #000000;">; </span><span style="color: #0000ff;">if</span> (smartStrlen(<span style="color: #800080;">$string</span>) > <span style="color: #800080;">$length</span><span style="color: #000000;">) { </span><span style="color: #800080;">$length</span> -= smartStrlen(<span style="color: #800080;">$etc</span><span style="color: #000000;">); </span><span style="color: #0000ff;">if</span> (!<span style="color: #800080;">$break_words</span> && !<span style="color: #800080;">$middle</span><span style="color: #000000;">) { </span><span style="color: #800080;">$string</span> = <span style="color: #008080;">preg_replace</span>('/\s+?(\S+)?$/', '', smartSubstr(<span style="color: #800080;">$string</span>, 0, <span style="color: #800080;">$length</span>+1<span style="color: #000000;">)); } </span><span style="color: #0000ff;">if</span>(!<span style="color: #800080;">$middle</span><span style="color: #000000;">) { </span><span style="color: #0000ff;">return</span> smartSubstr(<span style="color: #800080;">$string</span>, 0, <span style="color: #800080;">$length</span>).<span style="color: #800080;">$etc</span><span style="color: #000000;">; } </span><span style="color: #0000ff;">else</span><span style="color: #000000;"> { </span><span style="color: #0000ff;">return</span> smartSubstr(<span style="color: #800080;">$string</span>, 0, <span style="color: #800080;">$length</span>/2) . <span style="color: #800080;">$etc</span> . smartSubstr(<span style="color: #800080;">$string</span>, -<span style="color: #800080;">$length</span>/2<span style="color: #000000;">); } } </span><span style="color: #0000ff;">else</span><span style="color: #000000;"> { </span><span style="color: #0000ff;">return</span> <span style="color: #800080;">$string</span><span style="color: #000000;">; }}</span>?>
注意：在判断字符长度时，一个中文字符算1.0，一个英文字符算0.5，截取子字符串时不会出现参差不齐的情况.
使用方法：
{<span style="color: #800080;">$content</span>|smartTruncate:5:"..."}
ok,测试没有问题有问欢迎指出
How can you prevent session fixation attacks?Apr 28, 2025 am 12:25 AMEffective methods to prevent session fixed attacks include: 1. Regenerate the session ID after the user logs in; 2. Use a secure session ID generation algorithm; 3. Implement the session timeout mechanism; 4. Encrypt session data using HTTPS. These measures can ensure that the application is indestructible when facing session fixed attacks.
How do you implement sessionless authentication?Apr 28, 2025 am 12:24 AMImplementing session-free authentication can be achieved by using JSONWebTokens (JWT), a token-based authentication system where all necessary information is stored in the token without server-side session storage. 1) Use JWT to generate and verify tokens, 2) Ensure that HTTPS is used to prevent tokens from being intercepted, 3) Securely store tokens on the client side, 4) Verify tokens on the server side to prevent tampering, 5) Implement token revocation mechanisms, such as using short-term access tokens and long-term refresh tokens.
What are some common security risks associated with PHP sessions?Apr 28, 2025 am 12:24 AMThe security risks of PHP sessions mainly include session hijacking, session fixation, session prediction and session poisoning. 1. Session hijacking can be prevented by using HTTPS and protecting cookies. 2. Session fixation can be avoided by regenerating the session ID before the user logs in. 3. Session prediction needs to ensure the randomness and unpredictability of session IDs. 4. Session poisoning can be prevented by verifying and filtering session data.
How do you destroy a PHP session?Apr 28, 2025 am 12:16 AMTo destroy a PHP session, you need to start the session first, then clear the data and destroy the session file. 1. Use session_start() to start the session. 2. Use session_unset() to clear the session data. 3. Finally, use session_destroy() to destroy the session file to ensure data security and resource release.
How can you change the default session save path in PHP?Apr 28, 2025 am 12:12 AMHow to change the default session saving path of PHP? It can be achieved through the following steps: use session_save_path('/var/www/sessions');session_start(); in PHP scripts to set the session saving path. Set session.save_path="/var/www/sessions" in the php.ini file to change the session saving path globally. Use Memcached or Redis to store session data, such as ini_set('session.save_handler','memcached'); ini_set(
How do you modify data stored in a PHP session?Apr 27, 2025 am 12:23 AMTomodifydatainaPHPsession,startthesessionwithsession_start(),thenuse$_SESSIONtoset,modify,orremovevariables.1)Startthesession.2)Setormodifysessionvariablesusing$_SESSION.3)Removevariableswithunset().4)Clearallvariableswithsession_unset().5)Destroythe
Give an example of storing an array in a PHP session.Apr 27, 2025 am 12:20 AMArrays can be stored in PHP sessions. 1. Start the session and use session_start(). 2. Create an array and store it in $_SESSION. 3. Retrieve the array through $_SESSION. 4. Optimize session data to improve performance.
How does garbage collection work for PHP sessions?Apr 27, 2025 am 12:19 AMPHP session garbage collection is triggered through a probability mechanism to clean up expired session data. 1) Set the trigger probability and session life cycle in the configuration file; 2) You can use cron tasks to optimize high-load applications; 3) You need to balance the garbage collection frequency and performance to avoid data loss.
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.
Zend Studio 13.0.1
Powerful PHP integrated development environment
mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),
SublimeText3 Chinese version
Chinese version, very easy to use
Atom editor mac version download
The most popular open source editor
