如何将大数组切成小数组

如何将任意长度的句子切成5个单词的数组？

换一种说法:

$Dummy = "Here is  a long sentence, but what I need to make out of this sentence 
          is that it should be chunked off to smaller arrays with 5 words each."

我想用PHP的答案.

在此先感谢解决它的人.

见array_chunk().

$words = str_word_count($sentence, 1);
$chunks = array_chunk($words, 5);