Echo next row from MySQL - php

Question

To select the previous row in MySQL I use the following script, which works perfect:
<?php
$previous = $row['id'] - 1;
$stmt = $db->query("SELECT * FROM data WHERE id = $previous");
while($row =$stmt->fetch()){echo ''.$row['title'].'';}
?>
In order to select the next row I want to use this script:
<?php
$next = $row['id'] + 1;
$stmt = $db->query("SELECT * FROM data WHERE id = $next");
while($row =$stmt->fetch()){echo ''.$row['title'].'';}
?>
This fetch the first record of the database and not the next row.

Answer 1

When you retrieve the previous row values, you write the data to $row, so when trying to fetch the next row, the value of $row['id'] is in fact the previous row id.
So store the value...
$currentID = $row['id'];
$previous = $currentID - 1;
// Other code
$next = $currentID + 1;

Answer 2

that is not the way you use mysql queries, you only want to run one query and then you loop on your results
either someting like
<?php
$stmt = $db->query("SELECT * FROM data ORDER BY id");
while($row =$stmt->fetch()){
echo ''.$row['title'].'';
}
?>
or
<?php
$stmt = $db->query("SELECT * FROM data ORDER BY id");
$results = $stmt->fetch_all(MYSQLI_ASSOC);
foreach ( $results as $key => $row ) {
echo ''.$row['title'].'';
}
?>

Answer 3

There is not need to add '1' in id and get the data. Its a bad idea. Accordingly if you want a next record then you should check a greater then, else use a lesser then for previous record. Simply...
$id=$row['id'];
next:
select * from <yout_table> where id = (select min(id) from <yout_table> where id > '$id')
previous:
select * from <yout_table> where id = (select max(id) from <yout_table> where id < '$id')
Its is work definitely....