What is the difference between one-dimensional array and two-dimensional array in php

phpThe difference between one-dimensional array and two-dimensional array: 1. One-dimensional array refers to an array with only one row of data, while two-dimensional array refers to an array with multiple rows of data and multiple columns of data; 2. A one-dimensional array only requires one subscript to access elements, while a two-dimensional array requires two subscripts to access elements; 3. One-dimensional arrays are mainly used to store a set of data, while two-dimensional arrays are mainly used to store two-dimensional data, such as Matrices, graphics, etc.

The operating system of this tutorial: Windows 10 system, PHP8.1.3 version, DELL G3 computer.

1. One-dimensional array

Definition: A one-dimensional array refers to an array with only one row of data, in which each element is the same type of data.

Features:

One-dimensional array is a row of data, and each element has the same data type. Array elements can be accessed through subscripts, which start from 0 and increase in sequence. One-dimensional arrays can be used to store a set of data, such as a set of integers, a set of characters, etc.

Sample code:

int arr[5] = {1, 2, 3, 4, 5};

The above code defines a one-dimensional array containing 5 integers, with the values ​​of each element being 1, 2, 3, 4, and 5 respectively.

2. Two-dimensional array

Definition: A two-dimensional array refers to an array with multiple rows of data and multiple columns of data, where each element is of the same type data.

Features:

A two-dimensional array is a matrix with the concepts of rows and columns, and the data type of each element is the same. Array elements can be accessed via row and column subscripts, with row subscripts starting at 0 and column subscripts starting at 0 and increasing in sequence. Two-dimensional arrays can be used to store two-dimensional data, such as matrices, graphics, etc.

Sample code:

int arr[3][4] = {
  {1, 2, 3, 4},
  {5, 6, 7, 8},
  {9, 10, 11, 12}
};

The above code defines a two-dimensional array containing 3 rows and 4 columns. The value of each element is 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12.

3. Difference

As can be seen from the above definitions and characteristics, the main differences between one-dimensional arrays and two-dimensional arrays are as follows:

Dimensions are different: a one-dimensional array has only one row of data, and a two-dimensional array has multiple rows and columns of data. The access methods are different: a one-dimensional array only requires one subscript to access an element, and a two-dimensional array requires two subscripts to access an element. The stored data is different: one-dimensional arrays are mainly used to store a set of data, and two-dimensional arrays are mainly used to store two-dimensional data, such as matrices, graphics, etc.

4. Summary

One-dimensional arrays and two-dimensional arrays are common data structures, each with their own characteristics and uses. In actual programming, appropriate array types should be selected according to needs to store and operate data.

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