PHP 字符串转换为以单词开头为键的数组

Question

假设我有以下字符串

$str = "once in a great while a good-idea turns great";

创建数组的最佳解决方案是什么，数组键是单词开始处的字符串计数？

$str_array['0'] = "once";
$str_array['5'] = "in";
$str_array['8'] = "a";
$str_array['10'] = "great";
$str_array['16'] = "while";
$str_array['22'] = "a";
$str_array['24'] = "good-idea";
$str_array['34'] = "turns";
$str_array['40'] = "great";

Answer 1

简单如下:

str_word_count($str, 2);

str_word_count() 的作用是

str_word_count() — Return information about words used in a string