How to implode array indexes?

问题

Is it possible to implode array's indexes? A function is returning me an array and what I need are the indexes of that array so I want to implode only inexes with comma or any other character for my db work

回答1:

You mean something like this...

implode(',', array_keys($some_arr));

... right? ) Here's documentation for array_keys; in short, when called with a single argument (an array), this function just returns all its keys (as array).

来源：https://stackoverflow.com/questions/12486021/how-to-implode-array-indexes