时间：2021-07-01 10:21:17 帮助过：2人阅读
具体内容如下
程序开始运行， 按"浏览"钮选择一个英文文档， 再按"统计 Statistics"钮， 即可得到按字母顺序列出的所有单词，及其出现的次数
用于测试的数据文档： data.txt
驱动程序：word.php
output.php 和 StringTokenizer.php 是 要求在同一个文件夹中的程序
1. words_statistics_PHP.png
2. word.php
<html>
<style>
td{
background-color:#CF6;
width:100px;
margin:5px;
}
</style>
<body>
<?php
/**
* 程序开始运行， 按"浏览"钮选择一个英文文档， 再按"统计"钮，
* 即可得到按字母顺序列出的所有单词，及其出现的次数
*
* 作者： 许同春 author Tongchun Xu
* @开源中国 Open Source, Chna communiity
* 完成日期：2016年6月10日 completion date: 10 June, 2016
*/
require("StringTokenizer.php");
require("output.php");
if($_POST['submit']){
if ($_FILES["file"]["error"] > 0)
echo "Error: " . $_FILES["file"]["error"] . "<br />";
else {
$myfile = fopen($_FILES["file"]["tmp_name"], "r") or die("Unable to open file!");
$str = fread($myfile,filesize($_FILES["file"]["tmp_name"]));
$delim = "?\\,. /:!\"()\t\n\r\f%";
$st = new StringTokenizer($str, $delim);
echo '找到字符串: '.$st->countTokens();
$list=new LinkedList();
while ($st->hasMoreTokens()) {
$list->orderInsert($st->nextToken());
}
$list->words_count();
$list->traversal();
fclose($myfile);
}
}
?>
<h2>英文文档单词统计 Statistics on English words </h2>
<p>程序开始运行， 按"浏览"钮选择一个英文文档， 再按"统计 Statistics"钮，
即可得到按字母顺序列出的所有单词，及其出现的次数 </p>
<form action="word.php" method="post"
enctype="multipart/form-data">
<label for="file">英文文档名 File Name:</label>
<input type="file" name="file" id="file" />
<input type="submit" name="submit" value="统计 Statistics" />
</form>
</body>
</html>3. output.php
<meta charset="utf-8" />
<?
/**
* The class LinkedList allows an application to store strings in
* alphabetical order by calling orderInsert().
* 此处定义的 LinkedList 类，可以调用它的 方法 orderInsert(),来以字母
* 大小的顺序储存 英文字符串。
* 同时记录 英文单词出现的次数
* 作者： 许同春 author Tongchun Xu
* @开源中国 Open Source, China communiity
* 完成日期：2016年6月10日 completion date: 10 June, 2016
*/
class Node{
public $data;
public $frequency;
public $next;
function __construct($data, $next = null, $frequency = 1){
$this->data = $data; //英文字符串
$this->next = $next; //指向后继结点的指针
$this->frequency=$frequency; //英文字符串出现的次数
}
}
class LinkedList{
private $head; //单链表的头结点，不存储数据
function __construct(){//单链表的构造方法
//头结点的数据为"傀儡", 不代表 任何数据
$this->head = new Node("dummy 傀儡");
$this->first = null;
}
function isEmpty(){
return ($this->head->next == null);
}
/* orderInsert($data) 方法，
* 按给定字符串 $data 的大小, 将其安插到适当的位置，
* 以保证单链表中字符串的存储，始终是有序的。
*/
function orderInsert($data){
$p = new Node($data);
if($this->isEmpty()){
$this->head->next = $p;
}
else {
$node= $this->find($data);
if(!$node){
$q = $this->head;
while($q->next != NULL && strcmp($data, $q->next->data)> 0 ){
$q = $q->next;
}
$p->next = $q->next;
$q->next = $p;
}else
$node->frequency++;
}
}
function insertLast($data){//将字符串插到单链表的尾部
$p = new Node($data);
if($this->isEmpty()){
$this->head->next = $p;
}
else{
$q = $this->head->next;
while($q->next != NULL)
$q = $q->next;
$q->next = $p;
}
}
function find($value){//查询是否有给定的字符串
$q = $this->head->next;
while($q->next != null){
if(strcmp($q->data,$value)==0){
break;
}
$q = $q->next;
}
if ($q->data == $value)
return $q;
else
return null;
}
function traversal(){//遍历单链表
if(!$this->isEmpty()){
$p=$this->head->next;
echo "输出结果：<table><tr>";
echo "<td>".$p->data."<br>出现次数：".$p->frequency."</td>";
$n=1;
while($p->next != null){
$p=$p->next;
echo "<td>".$p->data."<br>出现次数：".$p->frequency."</td>";
$n++;
if ($n%11==0) echo "</tr><tr>";
}
echo "</tr></table>";
}else
echo "链表为空！";
}
function words_count(){
if($this->isEmpty())
echo "<br>没有储存字符串 <br>";
else{
$counter=0;
$p=$this->head->next;
while($p->next != null){
$p=$p->next;
$counter++;
};
echo "***共有单词 ".$counter." 个***";
}
}}
?>4. StringTokenizer.php
<?php
/**
* The string tokenizer class allows an application to break a string into tokens.
*
* @author Azeem Michael
* @example The following is one example of the use of the tokenizer. The code:
* <code>
* <?php
* $str = "this is:@\t\n a test!";
* $delim = " !@:'\t\n\0"; // remove these chars
* $st = new StringTokenizer($str, $delim);
* echo 'Total tokens: '.$st->countTokens().'<br/>';
* while ($st->hasMoreTokens()) {
* echo $st->nextToken() . '<br/>';
* }
* prints the following output:
* Total tokens: 4
* this
* is
* a
* test
* ?>
* </code>
*/
class StringTokenizer {
/** @var string
*/
private $string;
/** @var string
*/
private $token;
/** @var string
*/
private $delim;
/**
* Constructs a string tokenizer for the specified string.
* @param string $str String to tokenize
* @param string $delim The set of delimiters (the characters that separate tokens)
* specified at creation time, default to " \n\r\t\0"
*/
public function __construct($str, $delim=" \n\r\t\0") {
$this->string = $str;
$this->delim = $delim;
$this->token = strtok($str, $delim);
}
/**
* Destructor to prevent memory leaks
*/
public function __destruct() {
unset($this);
}
/**
* Calculates the number of times that this tokenizer's nextToken method can
* be called before it generates an exception
* @return int - number of tokens
*/
public function countTokens() {
$counter = 0;
while($this->hasMoreTokens()) {
$counter++;
$this->nextToken();
}
$this->token = strtok($this->string, $this->delim);
return $counter;
}
/**
* Tests if there are more tokens available from this tokenizer's string. It
* does not move the internal pointer in any way. To move the internal pointer
* to the next element call nextToken()
* @return boolean - true if has more tokens, false otherwise
*/
public function hasMoreTokens() {
return ($this->token !== false);
}
/**
* Returns the next token from this string tokenizer and advances the internal
* pointer by one.
* @return string - next element in the tokenized string
*/
public function nextToken() {
$hold = $this->token; //hold current pointer value
$this->token = strtok($this->delim); //increment pointer
return $hold; //return current pointer value
}
}
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