Associative Array 

<?php

//associative array:- 

    $a = array (

        "mac"=> 75000,

        "dell"=> 50000,

        "acer"=> 47000

    );

    //when we change the value then we type $variable then [bracket] = change value. 

    $a["dell"] = 57000;

    //print_r is for testing array value and key.

    echo "<pre>";

    print_r ($a)."<br>";

    echo "</pre>";

    //This one you call the key. The output comes only value not keyword (mind this).

    echo $a["acer"]."<br>";

    echo $a["mac"]."<br>";

    echo $a["dell"];

    //Associative array bahat jyada use hota hai database ke sath

?>

Output

Array
(
    [mac] => 75000
    [dell] => 57000
    [acer] => 47000
)

47000
75000
57000