What is the way to write three-dimensional array in php

In PHP, the value in an array can be another array, and the value of another array can also be an array. In this way, we can create a three-dimensional array, written like "$a3=array( array(array('a')));".

The operating environment of this article: windows7 system, PHP7.1 version, DELL G3 computer

What is the way to write a three-dimensional array in php?

The values ​​in one array can be another array, and the values ​​in another array can also be an array. In this way, we can create a two-dimensional or three-dimensional array:

For example:

Definition:

1-dimensional array: $a1=array('a') ;

2-dimensional array: $a2=array(array('a')); //That is, there is an array inside the array

3-dimensional array: $a3=array(array( array('a')));

Access:

1 dimension: $a1[0]; //Get element a, the same below as

2 dimension: $a2[0][0];

3 dimensions: $a3[0][0][0];

Special attention should be paid to:

$a2[$ a1[0]] This does not take the elements of the two-dimensional array, but indicates that $a2 is a one-dimensional array, and we want to take the element with the subscript $a1[0] in $a2.

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