Debug School

rakesh kumar
rakesh kumar

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Explain different type of array in php

Reference

PHP Arrays

PHP array is an ordered map (contains value on the basis of key). It is used to hold multiple values of similar type in a single variable.

Advantage of PHP Array

Less Code: We don't need to define multiple variables.

Easy to traverse: By the help of single loop, we can traverse all the elements of an array.

Sorting: We can sort the elements of array.

PHP Array Types

There are 3 types of array in PHP.

  1. Indexed Array
  2. Associative Array
  3. Multidimensional Array

PHP Indexed Array

PHP index is represented by number which starts from 0. We can store number, string and object in the PHP array. All PHP array elements are assigned to an index number by default.

There are two ways to define indexed array:

1st way:

$season=array("summer","winter","spring","autumn");
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2nd way:

$season[0]="summer";  
$season[1]="winter";  
$season[2]="spring";  
$season[3]="autumn";
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Example

File: array1.php
<?php  
$season=array("summer","winter","spring","autumn");  
echo "Season are: $season[0], $season[1], $season[2] and $season[3]";  
?>
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Output:

Season are: summer, winter, spring and autumn
File: array2.php

<?php  
$season[0]="summer";  
$season[1]="winter";  
$season[2]="spring";  
$season[3]="autumn";  
echo "Season are: $season[0], $season[1], $season[2] and $season[3]";  
?>
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Output:

Season are: summer, winter, spring and autumn
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PHP Associative Array

We can associate name with each array elements in PHP using => symbol.

There are two ways to define associative array:

1st way:

$salary=array("Sonoo"=>"350000","John"=>"450000","Kartik"=>"200000");
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2nd way:

$salary["Sonoo"]="350000";  
$salary["John"]="450000";  
$salary["Kartik"]="200000";
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Example
File: arrayassociative1.php

<?php    
$salary=array("Sonoo"=>"350000","John"=>"450000","Kartik"=>"200000");    
echo "Sonoo salary: ".$salary["Sonoo"]."<br/>";  
echo "John salary: ".$salary["John"]."<br/>";  
echo "Kartik salary: ".$salary["Kartik"]."<br/>";  
?>
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Output:

Sonoo salary: 350000
John salary: 450000
Kartik salary: 200000
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File: arrayassociative2.php

<?php    
$salary["Sonoo"]="350000";    
$salary["John"]="450000";    
$salary["Kartik"]="200000";    
echo "Sonoo salary: ".$salary["Sonoo"]."<br/>";  
echo "John salary: ".$salary["John"]."<br/>";  
echo "Kartik salary: ".$salary["Kartik"]."<br/>";  
?>
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Output:

Sonoo salary: 350000
John salary: 450000
Kartik salary: 200000

Traversing PHP Associative Array
By the help of PHP for each loop, we can easily traverse the elements of PHP associative array.

<?php    
$salary=array("Sonoo"=>"550000","Vimal"=>"250000","Ratan"=>"200000");  
foreach($salary as $k => $v) {  
echo "Key: ".$k." Value: ".$v."<br/>";  
}  
?>
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Output:

Key: Sonoo Value: 550000
Key: Vimal Value: 250000
Key: Ratan Value: 200000

PHP Multidimensional Array

PHP multidimensional array is also known as array of arrays. It allows you to store tabular data in an array. PHP multidimensional array can be represented in the form of matrix which is represented by row * column.

Definition

$emp = array  
  (  
  array(1,"sonoo",400000),  
  array(2,"john",500000),  
  array(3,"rahul",300000)  
  );
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PHP Multidimensional Array Example
Let's see a simple example of PHP multidimensional array to display following tabular data. In this example, we are displaying 3 rows and 3 columns.

Id  Name    Salary
1   sonoo   400000
2   john    500000
3   rahul   300000
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<?php    
$emp = array  
  (  
  array(1,"sonoo",400000),  
  array(2,"john",500000),  
  array(3,"rahul",300000)  
  );  

for ($row = 0; $row < 3; $row++) {  
  for ($col = 0; $col < 3; $col++) {  
    echo $emp[$row][$col]."  ";  
  }  
  echo "<br/>";  
}  
?>
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Output:

1 sonoo 400000
2 john 500000
3 rahul 300000

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