First post: Optional parameters in PHP function prototypes Why do you write this? , _php Tutorial

First post: Optional parameters in PHP function prototypes Why do you write this? ，

First, let's start. Write something simple.

Just started to learn PHP, when looking at PHP manual encountered a problem: in the function prototype with optional parameters, the optional parameters of the wording can not understand.

such as the Explode function

Array explode (string $delimiter, string $string [, int $limit])

Optional parameters are enclosed in "[square brackets]", then the third parameter is $limit optional.

But why not write it like this:

Array explode (string $delimiter, string $string, [int $limit])

It is impossible to understand the position of this comma.

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