使用所有NULL值创建关联数组的最简洁方法是什么？

For instance, creating the following array?

$myArray=array(
    'a'=>null,
    'b'=>null,
    'c'=>null,
    'd'=>null,
    'e'=>null,
    'f'=>null,
    'g'=>null,
    'h'=>null
);

$myArray = array_fill_keys(range('a','h'), null);

Demo

This is what you're looking for

$myArray = array_fill_keys(array('a','b','c','d','e','f','g','h'), null);