The first article is the beginning. Simply write something.
I just started learning PHP and encountered a problem when reading the PHP Manual: In the function prototype containing optional parameters, the optional parameters are not written in a way that I can understand.
For example, the explode function
<span>array explode ( string $delimiter , string $string [, int $limit ] ) </span>
optional parameters are enclosed in "[square brackets]", then the third parameter $limit is an optional parameter.
But why not write it like this:
<span>array explode ( string $delimiter , string $string ,[int $limit ] ) </span>
I really can’t understand the position of this comma.
The above introduces the first blog post: Why are the optional parameters in the PHP function prototype written like this? , including relevant content, I hope it will be helpful to friends who are interested in PHP tutorials.
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
