How to define a two-dimensional array in php

In PHP, defining a two-dimensional array is actually defining an array, and each element in the array is still an array. Let's take a look at how to define a two-dimensional array in PHP.

Define the basic format of a two-dimensional array:

$array = array(
    array(value1, value2, value3, …),
    array(value1, value2, value3, …),
    array(value1, value2, value3, …),
    …
);

where $array is the array name, value1, value2, value3, etc. are all the values ​​of the array elements. In a two-dimensional array, the values ​​of the array elements are also arrays, so they also have their own subscripts.

Let’s look at an example below, using a two-dimensional array to represent student information in a class. Each student's information includes name, age, gender, grades, etc.

// 定义班级学生信息的二维数组
$students = array(
    // 学生1的信息
    array('name' => '张三', 'age' => 18, 'gender' => '男', 'score' => array(78, 88, 92)),

    // 学生2的信息
    array('name' => '李四', 'age' => 19, 'gender' => '女', 'score' => array(85, 92, 86)),

    // 学生3的信息
    array('name' => '王五', 'age' => 20, 'gender' => '男', 'score' => array(90, 94, 87)),

    // 学生4的信息
    array('name' => '赵六', 'age' => 19, 'gender' => '女', 'score' => array(91, 95, 89))
);

// 取出学生1的成绩
echo $students[0]['score'][0];   // 输出 78

In the above code, we define a two-dimensional array $students, which contains four elements, each element is an array containing student information. The array of each student's information has four elements, namely name, age, gender and grades, where the grades are another array.

If we want to get the score of student 1, we can use $students[0]['score'][0], where $students[0] means The first element in the array is the information array of student 1. ['score'] represents the element named score in this array, [0] represents the element in the score array the first element of .

To summarize, the basic format for defining a two-dimensional array is array(array(value1, value2, value3, …), array(value1, value2, value3, …), …), Each array element is an array, the subscript of the array element can be a number or a string, and the value of the element can be of any type, including arrays. When accessing two-dimensional array elements, you can use the form [index1][index2] to access each array element in turn.

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