Multi-Dimensional Arrays in Php

Published on : July 22,2022
Multi-Dimensional Arrays in Php

Hi Developer,

This article will learn about multi dimensional arrays in PHP. multi dimensional is array of array

 

Introduction

we will introduce you to two-dimensional arrays in PHP. We have discussed the arrays before containing one key against each value, but multidimensional arrays consist of arrays of arrays. So, there can be multiple keys against a value in multidimensional arrays.

 

What is two-dimensional arrays in Php


A two-dimensional array is an array of arrays. For your better understanding, we would like to define the three-dimensional array as an array of arrays of arrays.

So, dimensionality refers to the number of arrays within arrays.

 

Syntax of the two-dimensional array in Php

The general syntax of two-dimensional array in Php is:

array (
    array (elements...),
    array (elements...),
   ...
)

 

Example of the two-dimensional array in Php


Let’s make show you practical example of a two-dimensional array in Php. For this purpose, consider the following data table. We want to store this table’s data into a two-dimensional array.

Name    Stock     Sold

AA      21         12
BB      12         9
CC      22         1
DD      17         12

The above table contains two parameters for a complete description of each row of stock and sold data. A one-dimensional array cannot store this information because we need more than one key to point to this data. Solving this problem by using the two-dimensional array approach.

$demo = array (
  array("AA",21,12),
  array("BB",12,9),
  array("CC",22,1),
  array("DD",17,12)
);

The main array will hold four arrays forming the two dimensions inside the memory. These four arrays consist of two indices to store Stock and Sold values. For getting a clear idea of how a 2D array forms its dimensions, refer to the figure above in this article.

 

How to access values in two-dimensional array Php

<?php
echo $demo[0][0].": In stock: ".$demo[0][1].", sold: ".$demo[0][2].".<br>";
echo $ demo[1][0].": In stock: ".$demo[1][1].", sold: ".$demo[1][2].".<br>";
echo $ demo[2][0].": In stock: ".$demo.", sold: ".$demo[2][2].".<br>";
echo $ demo[3][0].": In stock: ".$demo.", sold: ".$demo[3][2].".<br>";
?>

The next question that is arising in your mind will surely be how to traverse a two-dimensional array. In this next section, we will answer it.

 

How to traverse two-dimensional arrays in Php


Like we have used a loop to traverse the one-dimensional array, we use the same approach to traverse the two-dimensional array as well, but with little different logic.

<?php
for ($r = 0; $r < 4; $r++) {
  echo "<p><b>Row number $r</b></p>";
  echo "<ul>";
  for ($c = 0; $c < 3; $c++) {
    echo "<li>".$demo[$r][$c]."</li>";
  }
  echo "</ul>";
}
?>

We have used nested for loop i:e for loop inside for loop. The inner for loop is responsible for printing columns, and it executes 3 times for every single run of the outer loop, which is responsible for printing the rows of the vehicle array.

*  Note: You can use the count function instead of specifying the number of rows and columns.

*  Note: var_dump() function in Php displays the structure of an array.

 

Try It

<?php

echo "Welcome to multi dimensional arrays in php <br>";

// Creating a two-dimensional array
$multiDim = array(array(2,5,7,8),
                  array(1,2,3,1),
                  array(4,5,0,1));


// echo var_dump($multiDim);
// echo $multiDim[1][2];

// Printing the contents of a two-dimensional array

// for ($i=0; $i < count($multiDim); $i++) { 
//     echo var_dump($multiDim[$i]);
//     echo "<br>";
// }

for ($i=0; $i < count($multiDim); $i++) { 
    for ($j=0; $j < count($multiDim[$i]); $j++) { 
        echo $multiDim[$i][$j];
        echo " ";
    }
    echo "<br>";
}
?>

 

Hope it can help you…

Categories : PHP

Tags : PHP Laravel

Praful Sangani
Praful Sangani
I'm a passionate full-stack developer with expertise in PHP, Laravel, Angular, React Js, Vue, Node, Javascript, JQuery, Codeigniter, and Bootstrap. I enjoy sharing my knowledge by writing tutorials and providing tips to others in the industry. I prioritize consistency and hard work, and I always aim to improve my skills to keep up with the latest advancements. As the owner of Open Code Solution, I'm committed to providing high-quality services to help clients achieve their business goals.
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