php:用字母作为分隔符将字符串拆分为数组

Question

如何拆分$str任何拉丁字母作为分隔符的部分？

$str = "     Hello! How are you? How are you   doing?  ";

应该返回一个数组

$arr  = ("     ", "! ", " ", " ", "? ", " ", " ", "   ", "?  ");

Answer 1

使用正则表达式.拆分1个或多个+字符a-z或A-Z:

$arr = preg_split('/[a-zA-Z]+/', $str);

在字符类中添加您想要的任何内容,[]例如0-9数字或'撇号等...