取得3個字的字串數

Question

我試圖只在一個字符串中獲得3個單詞的單詞頻率。 例如：

$ string =“這是一個示例文本。它是作為示例的示例文本。”;

我想要輸出：

“是一個樣本”（2）

“示例文本”（2）

.... 等等

提前致謝。

Answer 1

用空格作為分隔符來展開句子並循環通過。

<?php
$string = "This is a sample text. It is a sample text used as an example.";
$arr = explode(' ',$string);
$i=0;
foreach($arr as $k=>$v)
{
echo $arr[$i]." ".$arr[$i+1]." ".$arr[$i+2]."<br>";
$i++;
}

OUTPUT :

This is a
is a sample
a sample text.
sample text. It
text. It is
It is a
is a sample
a sample text
sample text used
.....

Answer 2

$string = "This is a sample text. It is a sample text used as an example.";
$words = preg_split('/\W/', $string);
$wordsPerRow = 3;


$offset = 0;
while ($offset < count($words)) {
    print implode(' ', array_slice($words, $offset, $wordsPerRow)).PHP_EOL;
    $offset += $wordsPerRow;
}