//There are two ways to define an array
$shu = array (1,5,1.1,'I am a string');
echo '<pre>; ; //Output HTML code, which means line breaks to make the page more beautiful
//The output subscript starts from 0, such as: array(5){
[0]=>
int(1) //The first character of the output array is an integer number 1
}
2
0
0
Has my IQ dropped so much? I actually can't see that this is a problem.
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
