php - 如何防止字符串中的大写缩略语中的单词中断

Question

我有以下的话：

$string1 = ucwords("bookingID");
substr(preg_replace("/([A-Z])/", ',\\1', $string1), 1))

输出就像：Booking I D

但如果有两个连续的大写字母，我想避免插入空格。

预期输出：booking ID

如果我输入了像bookingAmountReceived这样的词，那么预期的输出是：Booking Amount Received

Answer 1

使用量词：

preg_replace("/[A-Z]+/", ",$0", $string1);

Answer 2

$String = 'bookingAmountReceived';
$Words = preg_replace('/[A-Z][a-z]+/', ' $0 ', ucfirst($String));
echo $Words;

Answer 3

preg_replace("/[A-Z]+/", " $0", $string1);