如何使用HTML和Ajax提交数组并将其作为数组发送给PHP？

I'm trying to submit some of my HTML inputs as an array, and use it in PHP, but the other inputs are being passed to PHP by Ajax (using jQuery). So I need to get the value of the inputs and send them to a PHP file by Ajax. My inputs are like these:

<input value="..." type="hidden" name="something[]" />
<input value="..." type="hidden" name="something[]" />
<input value="..." type="hidden" name="something[]" />

I have never used this way to submit an array and just saw it. I will be thankful if someone explains this way (name="something[]").