php：将字符串拆分为数组作为分隔符

Question

如何将$str拆分为任何拉丁字母为分隔符的部分？

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

应返回

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

Answer 1

阵列使用正则表达式。在1个或更多字符+或a-z分裂A-Z：

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

在字符类添加任何你想要的0-9的数字或'的撇号等这样[] ...