如何从句子中获取最后 n 个单词？ [复制]

Question

我想得到一个句子的最后 n 个（例如最后 5 个）单词。我怎么才能得到它 ？下面的代码给出了想要的结果，但这需要计算句子中剩余的单词。

<?php
$string = "This is an example to get last five words from this sentence";
$pieces = explode(" ", $string);
echo $first_part = implode(" ", array_splice($pieces, 0,7));
echo "<hr/>";
echo $other_part = implode(" ", array_splice($pieces, 0));
?>

我希望是否有像get first n words from a sentence 这样的直接方法。

注意：这不是How to obtain the last word of a string 的副本。我想要最后 n 个单词，而不是最后 nth 个单词。

Answer 1

最后5个

$string = "This is an example to get last five words from this sentence";
$pieces = explode(" ", $string);
echo $first_part = implode(" ", array_splice($pieces, -5));

Answer 2

你可以这样做

<?php
$string = "This is an example to get last five words from this sentence";
$pieces = explode(" ", $string);
$yourValue = 5; //set for how many words you want.
$count = count($pieces) - $yourValue;//this will do its job so you don't have to count.
echo $first_part = implode(" ", array_splice($pieces, 0,$count));
echo "<hr/>";
echo $other_part = implode(" ", array_splice($pieces, 0));
?>

Answer 3

这不是你要找的吗？

$nWord = 3;
$string = "This is an example to get last five words from this sentence";
$arr = explode(" ",$string);
$output = array_slice(array_reverse($arr), 0, $nWord);
$output = implode(" ", $output);
print_r($output);