按单词反转一个英文句子

首先定义$a = "we are family";

笨笨的写法：

//将字符串分割成数组
$b = explode(" ",$a);
//反转数组
$b = array_reverse($b);
//将反转后的数组变为字符串
$a = implode(" ",$b);

可以将三行代码简化为一行代码~

$a =  implode(" ",array_reverse(explode(" ",$a)));