Array in PHP and its types | Index, Associative and Multidiamensional


Array:
-Array in PHP is the type of data structure that store multiple elements of similar data types under a single variable
-Array creates a list of elements of similar types that can be accessed [] of the key.
-An array is created using array() function in PHP

 [Array in PHP:
Array is a collection of similar data types]

 Types of Array in PHP:

  1. Index or Numeric Array
  2. Associative Array
  3. Multidimensional Array
1.Index Array:-

-Index array represented by the numbers, Numeric index array start from 0.
-Index arrays use number or index as the access key.
-An access key is a reference to memory slot in an array variable.
-The access key is used whenever we want to read or assign a new value to an array element.

Syntax:

<?php
 $variable_name[n]=value;
?>


Example:

<!DOCTYPE html>
<html>
<head>
 <title>cwipedia.in</title>
</head>
<body>

<?php

$a[0]="Hi";
$a[1]="Hey";
echo "<br>Index Array<br>";
echo $a[0],"<br/>",$a[1];
?>

</body>
</html>


2.Associative Array:-

-An associative array is similar to index array but instead of linear storage and every value can be assigned with user-defined by the key of a string type.
-An array with String index where instead of linear storage, each value can be assigned a specific key.
-Associative array differs from the numeric array in the sense that associative array uses descriptive names for id keys.

Syntax:

<?php
 $variable_name=$array(Keyname => value)
?>


Example:

<!DOCTYPE html>
<html>
<head>
 <title>cwipedia.in</title>
</head>
<body>

<?php
$c=array("CSE"=>"101","CIVIL"=>"102");
echo "<br>Associative Array";
echo "<br>CSE=",$c["CSE"],"<br>CIVIL=",$c["CIVIL"];  

?>

</body>
</html>


3.Multidimensional Array:-
-Multidimensional contain single or multiple arrays that can be accessed multiple indices or key.
-In this type can create one dimensional and multidimensional array.
-The advantage of multidimensional arrays is that they allow us to group related data together.
Syntax:

?php 

$variable_name=array(
                    array(element....),
                    array(element....),
                    .
                    .
                    .
                     ) 

?>


Example:

<!DOCTYPE html>
<html>
<head>
 <title>cwipedia.in</title>
</head>
<body>

<?php
$person=array(
 array("Name"=>"Shivam",
 "Email"=>"shivam@gmail.com"),
 array("Name"=>"XYZ",
   "Email"=>"xyz@gmail.com")
); 
echo "<br>Multidiamentional Array";
echo "<br>Shivam's Email Id:- ",$person[0]["Email"];

?>

</body>
</html>

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