How to get data from php two-dimensional array

In PHP, array is a very common data type. An array can store a single value or multiple values. The advantage of an array is that it can handle related data uniformly.

In PHP, a two-dimensional array refers to an array containing multiple one-dimensional arrays. As shown below:

$students = array(
    array("name"=>"张三", "age"=>"18", "score"=>"90"),
    array("name"=>"李四", "age"=>"19", "score"=>"88"),
    array("name"=>"王五", "age"=>"20", "score"=>"95")
);

This array $students contains three one-dimensional arrays, each one-dimensional array represents a student's information, including name, age and grades.

So, let’s take a look at how to get the data of a two-dimensional array in PHP.

Getting through subscripts

In PHP, we can get the data of a two-dimensional array through subscripts. The subscript refers to the position of the array element in the array, and the subscript starts from 0.

When getting two-dimensional array data, you need to use two subscripts, one subscript points to the one-dimensional array, and the other subscript points to the element that needs to be obtained.

The sample code is as follows:

echo $students[0]["name"]; // 输出：张三
echo $students[1]["age"];  // 输出：19
echo $students[2]["score"];// 输出：95

This code obtains the names, ages and grades of three students through $students[0]["name"], $students1 and $students2. .

Loop acquisition

In addition to obtaining the data of the two-dimensional array through subscripts, we can also obtain the elements in the array through loops. By looping, you can traverse the entire array to obtain the data in the entire array at once.

In PHP, we usually use a foreach loop to traverse an array. The sample code is as follows:

foreach ($students as $key => $value) {
    echo "第" . ($key + 1) . "个学生的名字是：" . $value["name"] . "<br>";
    echo "第" . ($key + 1) . "个学生的年龄是：" . $value["age"] . "<br>";
    echo "第" . ($key + 1) . "个学生的成绩是：" . $value["score"] . "<br>";
}

This code traverses the entire $students array through a foreach loop. $key and $value are used in the loop body to represent the subscript and element value of the array respectively. Through $value["name"], $value["age"] and $value["score"], the names, ages and grades of three students were obtained respectively.

Summary

Through the above two methods, we can get the data of the two-dimensional array in PHP. The elements in the array can be accurately obtained through subscript retrieval, while the loop retrieval can traverse the entire array and obtain the data in the array in batches. According to different needs, we can choose the appropriate way to obtain the data in the array.

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