PHP multidimensional array

In the previous tutorial, we have learned that an array is a simple list of numbers/values.

Sometimes we want to use more than one key to save data, so we need to use PHP's multi-dimensional array to achieve it.

Basic knowledge

##PHP multidimensional array refers to a More than one array

PHP can understand it as a multi-dimensional array of two, three, four or five levels or even more levels. However, most people have trouble managing arrays that are more than three levels deep

Note: The dimension of the array indicates the index number of elements that need to be selected

php two-dimensional array

A two-dimensional array is an array of arrays. Similarly, a three-dimensional array is an array of arrays.

Note: A two-dimensional array requires two indexes to select elements

Example

Suppose there is a score sheet

## Xiao Ming Xiaolong## 小花 9 95 94

We can save the array in the above table in a two-dimensional array,

$arr=array(
array("Xiao Ming" ,"90","80","77"),
array("小龙","88","75","89"),
array("小花","99"," 95","94"),
);

Use the code to output the result:

<?php
header("Content-type:text/html;charset=utf-8");
$arr=array(
    array("小明","90","80","77"),
    array("小龙","88","75","89"),
    array("小花","99","95","94"),
);
echo $arr[0][0]."---语文：".$arr[0][1].":数学：".$arr[0][2].":英语:".$arr[0][3]."<br>";
echo $arr[1][0]."---语文：".$arr[1][1].":数学：".$arr[1][2].":英语:".$arr[1][3]."<br>";
echo $arr[2][0]."---语文：".$arr[2][1].":数学：".$arr[2][2].":英语:".$arr[2][3]."<br>";
?>

The program running result:

Xiaoming---Chinese: 90: Mathematics: 80: English: 77
Xiaolong---Chinese: 88: Mathematics: 75: English: 89
Xiaohua---Chinese: 99: Mathematics: 95: English: 94

We can also use another for loop inside a for loop to get the elements in the array

Example

<?php
header("Content-type:text/html;charset=utf-8");
$arr=array(
    array("小明","90","80","77"),
    array("小龙","88","75","89"),
    array("小花","99","95","94"),
);
for($x=0;$x<3;$x++){
    echo "<p>行数$x</p>";
    echo"<ul>";
    for($row=0;$row<3;$row++){
        echo "<li>".$arr[$x][$row]."</li>";
    }
    echo"</ul>";
}
?>

Program running result:

Number of lines 0
• Xiao Ming
• 90
• 80
Line number 1
• Xiaolong
• 88
• 75
Line number 2
• Xiaohua
• 99
• 95

##PHP three-dimensional array

Note: Two-dimensional array requires two indexes to select elements

Example

<?php
$name=array(
    array(
        array('tom','andy','jack'),
       array('row','laya','lis')
    ),
);
print_r($name[0][1][1]);
?>

Program running result:

laya

Continuing Learning

new file

<?php header("Content-type:text/html;charset=utf-8"); $arr=array( array("小明","90","80","77"), array("小龙","88","75","89"), array("小花","99","95","94"), ); for($x=0;$x<3;$x++){ echo "<p>行数$x</p>"; echo"<ul>"; for($row=0;$row<3;$row++){ echo "<li>".$arr[$x][$row]."</li>"; } echo"</ul>"; } ?>

submit Reset Code

Automatic operation

Previous section Next Section

Tutorial List

get help

Course Recommendations
Courseware download

The courseware is not available for download at the moment. The staff is currently organizing it. Please pay more attention to this course in the future~

Students who have watched this course are also learning

Name	## Language	Mathematics	English
90	80	77
88	75	89

PHP multidimensional array

ElementaryImperial CMS enterprise imitation website tutorial

ElementaryNewbies with zero foundation in WordPress build personal blogs and corporate websites

ElementaryUltimate CMS zero-based website building instruction video

ElementaryFront-end project-Shangyou [HTML/CSS/JS technology comprehensive practice]

IntermediateVue3.0 from 0 to build a universal backend management system project practice

ElementaryZero-based front-end course [Vue advanced learning and practical application]

ElementaryWEB front-end tutorial [HTML5+CSS3+JS]

ElementaryQuick introduction to apipost

IntermediateVue3+TypeScript practical tutorial-enterprise-level project practice

ElementaryLet's briefly talk about starting a business in PHP

IntermediateVUE e-commerce project (front-end & back-end dual project actual combat)

ElementaryApipost practical application [api, interface, automated testing, mock]