爆炸成相等的部分

$str =  \"Hello fri3nd, you\'re looking good today!  What a Great day this is!  How     fancy and cool!\";
$pieces = explode(\" \",$str, 3);

print_r($pieces);

$pieces[0] = \'Hello\',

... and the rest of the string is all shoved into

<?php
$str =  \"Hello fri3nd, you\'re looking good today!  What a Great day this is!  How     fancy and cool!\";

$array = array_map(create_function(\'$a\', \'return implode(\" \", $a);\'), array_chunk(preg_split(\'/\\s+/\', $str), 3));
var_dump($array);

preg_split

implode

array_map

str_split

$pieces = str_split( $str, 3);