How to assign values ​​to a two-dimensional array in php

In PHP programming, array (Array) is a very commonly used data type and a data structure. PHP arrays can store values ​​of different data types, including numbers, strings, objects, functions, and other arrays.

Two-dimensional array is a form of array. It is an array composed of multiple one-bit arrays. It can be regarded as a table containing multiple rows and columns of data, such as students in a class. List information.

In PHP, creating a two-dimensional array is simple. The following are several methods of assigning two-dimensional arrays:

1. Direct assignment method

This method defines the value of each element directly when the array is initialized.

// 定义一个二维数组
$nameList = array(
    array('小明',18,'男'),
    array('小红',20,'女'),
    array('小兰',19,'女')
);

// 输出二维数组的元素
echo $nameList[0][0];  // 输出'小明'
echo $nameList[1][1];  // 输出'20'
echo $nameList[2][2];  // 输出'女'

2. Assignment method one by one

This method is assignment one by one, which can be achieved through loop statements or manual addition.

// 通过循环语句逐个赋值
$nameList = array();
for ($i=0; $i<3; $i++) {
    $nameList[$i] = array();
    $nameList[$i][0] = '姓名'.$i;
    $nameList[$i][1] = '年龄'.$i;
    $nameList[$i][2] = '性别'.$i;
}

// 手动添加的方式逐个赋值
$nameList = array();
$nameList[0] = array('小明',18,'男');
$nameList[1] = array('小红',20,'女');
$nameList[2] = array('小兰',19,'女');

// 输出二维数组的元素
echo $nameList[0][0];  // 输出'小明'
echo $nameList[1][1];  // 输出'20'
echo $nameList[2][2];  // 输出'女'

3. Dynamic assignment method

This method is to dynamically assign values ​​during the running of the program and can be implemented through some functions.

// 使用array_push()函数动态添加数组元素
$nameList = array();
array_push($nameList, array('小明',18,'男'));
array_push($nameList, array('小红',20,'女'));
array_push($nameList, array('小兰',19,'女'));

// 输出二维数组的元素
echo $nameList[0][0];  // 输出'小明'
echo $nameList[1][1];  // 输出'20'
echo $nameList[2][2];  // 输出'女'

The above three methods are common ways to assign two-dimensional arrays in PHP. No matter which method is used, you need to understand the basic operations of arrays in PHP in order to process two-dimensional array data more flexibly and efficiently.

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