MYSQL to json Object array

<?php
$link = mysqli_connect("localhost", "root", "", "asteriskcdrdb");

/* check connection */
if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}
$cars=array();

$query = " select * from  cdr limit 5";

if ($result = mysqli_query($link, $query)) {

    /* fetch associative array */
    while ($row = mysqli_fetch_assoc($result)) {
        echo "$row[uniqueid], $row[src]<br>";
      $row[uniqueid]=array("src"=>$row[src],"dst"=>$row[dst]);

$cars[]=$row[uniqueid];


   }

    /* free result set */
    mysqli_free_result($result);
}

$info=json_encode($cars);

print_r($info);

//else {

// printf("Error: %s\n", mysqli_error($link));

//}

/* close connection */

mysqli_close($link);

?>

[{"src":"+16145993800","dst":"s"},{"src":"+16145993800","dst":"600"},{"src":"+16145993800","dst":"600"},{"src":"100","dst":"500"},{"src":"+16145993800","dst":"600"}]