trie 的应用
应 CSDN 要求,收到 CSDN 月饼的应发散分贴
前贴已发,由于僧多粥少。故此结贴,比继续发帖散分
class TTrie {<br /> protected $buffer = array();<br /> protected $dict = array( array() );<br /> protected $input = 0; //字符串当前偏移<br /> protected $backtracking = 0; //字符串回溯位置<br /> public $debug = 0;<br /> public $savematch = 1;<br /><br /> function set($word, $action='') {<br /> if(is_array($word)) {<br /> foreach($word as $k=>$v) $this->set($k, $v);<br /> return;<br /> }<br /> $p = count($this->dict);<br /> $cur = 0; //当前节点号<br /> foreach(str_split($word) as $c) {<br /> if (isset($this->dict[$cur][$c])) { //已存在就下移<br /> $cur = $this->dict[$cur][$c];<br /> continue;<br /> }<br /> $this->dict[$p]= array(); //创建新节点<br /> $this->dict[$cur][$c] = $p; //在父节点记录子节点号<br /> $cur = $p; //把当前节点设为新插入的<br /> $p++;<br /> }<br /> $this->dict[$cur]['acc'] = $action; //一个词结束,标记叶子节点<br /> }<br /><br /> function match($s) {<br /> $ret = array();<br /> $cur = 0; //当前节点,初始为根节点<br /> $i =& $this->input; //字符串当前偏移<br /> $p =& $this->backtracking; //字符串回溯位置<br /> $s .= "\0"; //附加结束符<br /> $len = strlen($s);<br /> $buf = '';<br /> while($i < $len) {<br /> $c = $s{$i};<br /> if(isset($this->dict[$cur][$c])) { //如果存在<br /> $cur = $this->dict[$cur][$c]; //转到对应的位置<br /> if(isset($this->dict[$cur][$s[$i+1]])) {//检查下一个字符是否也能匹配,长度优先<br /> $i++;<br /> continue;<br /> }<br /> if(isset($this->dict[$cur]['acc'])) { //是叶子节点,单词匹配!<br /> if($buf != '') {<br /> $this->buffer[] = $buf;<br /> $buf = '';<br /> }<br /> if($this->savematch) $this->buffer[] = substr($s, $p, $i - $p + 1); //取出匹配位置和匹配的词<br /><br /> $ar = explode(',', $this->dict[$cur]['acc']);<br /> call_user_func_array( array($this, array_shift($ar)), $ar );<br /><br /> $p = $i + 1; //设置下一个回溯位置<br /> $cur = 0; //重置当前节点为根节点<br /> }<br /> } else { //不匹配<br /> $buf .= $s{$p}; //substr($s, $p, $i - $p + 1); //保存未匹配位置和未匹配的内容<br /> $cur = 0; //重置当前节点为根节点<br /> $i = $p; //把当前偏移设为回溯位置<br /> $p = $i + 1; //设置下一个回溯位置<br /> }<br /> $i++; //下一个字符<br /> }<br /> if(trim($buf, "\0")) $this->buffer[] = trim($buf, "\0");<br /> }<br /><br /> function __call($method, $param) {<br /> if($this->debug) printf("偏移:%d 回溯:%d\n", $this->input, $this->backtracking);<br /><br /> }<br />}<br />
------解决方案--------------------
这个是国庆中秋过节的福利么。。。
------解决方案--------------------

老大在各应我没发散分帖啊?哈哈 ...话说我早发到水区去了.嘿嘿
继续接分
------解决方案--------------------
初学绝对很有用
------解决方案--------------------
接分~~~~
是哪家的月饼啊
------解决方案--------------------
我看不到懂样
------解决方案--------------------

PHP remains important in modern web development, especially in content management and e-commerce platforms. 1) PHP has a rich ecosystem and strong framework support, such as Laravel and Symfony. 2) Performance optimization can be achieved through OPcache and Nginx. 3) PHP8.0 introduces JIT compiler to improve performance. 4) Cloud-native applications are deployed through Docker and Kubernetes to improve flexibility and scalability.

PHP is suitable for web development, especially in rapid development and processing dynamic content, but is not good at data science and enterprise-level applications. Compared with Python, PHP has more advantages in web development, but is not as good as Python in the field of data science; compared with Java, PHP performs worse in enterprise-level applications, but is more flexible in web development; compared with JavaScript, PHP is more concise in back-end development, but is not as good as JavaScript in front-end development.

PHP and Python each have their own advantages and are suitable for different scenarios. 1.PHP is suitable for web development and provides built-in web servers and rich function libraries. 2. Python is suitable for data science and machine learning, with concise syntax and a powerful standard library. When choosing, it should be decided based on project requirements.

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The reasons why PHP is the preferred technology stack for many websites include its ease of use, strong community support, and widespread use. 1) Easy to learn and use, suitable for beginners. 2) Have a huge developer community and rich resources. 3) Widely used in WordPress, Drupal and other platforms. 4) Integrate tightly with web servers to simplify development deployment.

PHP remains a powerful and widely used tool in modern programming, especially in the field of web development. 1) PHP is easy to use and seamlessly integrated with databases, and is the first choice for many developers. 2) It supports dynamic content generation and object-oriented programming, suitable for quickly creating and maintaining websites. 3) PHP's performance can be improved by caching and optimizing database queries, and its extensive community and rich ecosystem make it still important in today's technology stack.

In PHP, weak references are implemented through the WeakReference class and will not prevent the garbage collector from reclaiming objects. Weak references are suitable for scenarios such as caching systems and event listeners. It should be noted that it cannot guarantee the survival of objects and that garbage collection may be delayed.

The \_\_invoke method allows objects to be called like functions. 1. Define the \_\_invoke method so that the object can be called. 2. When using the $obj(...) syntax, PHP will execute the \_\_invoke method. 3. Suitable for scenarios such as logging and calculator, improving code flexibility and readability.


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