How do I index through a PHP array in Javascript using AJAX?

Question

I am very new to PHP and Javascript. I would like to use a PHP function in order to fetch database data as an array and be able to use it in Javascript. I am I have searched online but I haven't come across anything that helps my particular situation. How would I get the array in Javascript and be able to use it like so:

var arrayJS = arrayFromPhp;

My PHP code is below:

<?php
    function fetch(){

        $link = mysqli_connect("localhost", "root", "Southflorida8", "test");
        if ($result = mysqli_query($link, "SELECT * FROM aircraft")){


            if (!mysqli_query($link, "SET @a:='this will not work'")) {
                    printf("Error: %s\n", mysqli_error($link));
            }

            $array = mysqli_fetch_all($result);
            mysqli_free_result($result);


            return json_encode($array);
        }
    }

    if (isset($_POST['fetch'])){

        echo fetch();
    }
?>

Here is the Javascript:

var array = [];



           $.ajax({
                url: 'server.php',
                type: 'post',
                data: 'fetch',
                datatype: 'json',
                success: function(array) {alert(array);}
            });
 pubnub.publish({channel:pnChannel, message:{lat:array[0][1] , lng:array[0][2] }});

Answer 1

Try this.

    $.ajax({
        url: 'server.php',
        type: 'post',
        data: 'fetch',
        success: function(array) {
             array = JSON.parse(array);
             console.log(array);
        }
    });

**EDIT: ** And also update your php code.

Replace $array = mysqli_fetch_all($result); with $array = mysqli_fetch_all($result, MYSQLI_ASSOC);