Question

我有一项任务是在不使用str_word_count的情况下计算句子，我的大四学生给了我但是我无法理解。有人可以解释一下吗？

我需要了解变量及其工作原理。

<?php

$sentences = "this book are bigger than encyclopedia";

function countSentences($sentences) {
    $y = "";
    $numberOfSentences = 0;
    $index = 0;

    while($sentences != $y) {
        $y .= $sentences[$index];
        if ($sentences[$index] == " ") {
            $numberOfSentences++;
        }
        $index++;
    }
    $numberOfSentences++;
    return $numberOfSentences;
}

echo countSentences($sentences);

?>

输出

6

Answer 1

基本上，它只是计算一个句子中的空格数。

<?php

  $sentences = "this book are bigger than encyclopedia";

  function countSentences($sentences) {
    $y = ""; // Temporary variable used to reach all chars in $sentences during the loop
    $numberOfSentences = 0; // Counter of words
    $index = 0; // Array index used for $sentences

    // Reach all chars from $sentences (char by char)
    while($sentences != $y) {
      $y .= $sentences[$index]; // Adding the current char in $y

      // If current char is a space, we increase the counter of word
      if ($sentences[$index] == " "){
        $numberOfSentences++;
      }

      $index++; // Increment the index used with $sentences in order to reach the next char in the next loop round
    }

    $numberOfSentences++; // Additional incrementation to count the last word
    return $numberOfSentences;
  }

  echo countSentences($sentences);

?>

请注意，此函数在多种情况下会产生错误的结果，例如，如果您有两个空格，则此函数将计算2个单词而不是一个。

Answer 2

这是非常微不足道的事情，我会说。任务是计算句子中的单词。句子是一个字母（一系列字符），是字母或空格（空格，换行等）......

现在，这句话的一句话是什么？它是一组独特的字母，“不接触”其他字母组;意思是单词（字母组）用空格分隔（假设只是一个普通的空格）

因此，计算单词的最简单算法包括： - $ words_count_variable = 0 - 逐个浏览所有角色 - 每次找到空格时，就意味着在此之前刚刚结束的新单词，你必须增加$ words_count_variable - 最后，你会发现字符串的结尾，这意味着在此之前刚刚结束的一个单词，所以你最后一次增加你的$ words_count_variable

取“这是一句话”。

We set $words_count_variable = 0;

Your while cycle will analyze:
"t"
"h"
"i"
"s"
" " -> blank space: a word just ended -> $words_count_variable++ (becomes 1)
"i"
"s"
" " -> blank space: a word just ended -> $words_count_variable++ (becomes 2)
"a"
" " -> blank space: a word just ended -> $words_count_variable++ (becomes 3)
"s"
"e"
"n"
...
"n"
"c"
"e"
-> end reached: a word just ended -> $words_count_variable++ (becomes 4)

所以，4。计算4个字。

希望这有用。

有人可以向我解释这个'计算句子'的PHP代码吗？

2 个答案: