I would like to know how to retrieve the title of a row based on its id.
Its for href link based of next and previous buttons. The id will be determined by
current id-1= previous id ($pid) and current id+1=next id ($nid)
I have $nid
and $pid
, but now i want to get the title of that respective id in the database. Now i am getting only the current id title displayed in the url..
href="features/headlines/<?php echo $pid; ?>/<?php echo $title; ?>"
i want the $title
to show the title corresponding to the $pid
but now i am only getting the title of the current id.
I tried <?php echo $pid[title]; ?>
<?php echo $pid[title]; ?>
It would be something to the effect of:
<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");
$current_id = 6; // Whatever your current ID is here..
// Notice the subtraction from $current_id
$query = "SELECT `title` FROM `table` WHERE `id` = '".($current_id-1)."'";
// Would output:
// SELECT `title` FROM `table` WHERE `id` = '5'
$result = $mysqli->query($query);
$row = $result->fetch_assoc();
$previous_title = $row['title'];
?>
You are trying to use a normalized database schema. This is good! (unless you are talking about some abstract data type in PHP)
If I'm understanding you correctly, you need a special sort of "key" on your column, specifically the primary key with the attribute AUTO_INCREMENT
How to make MySQL table primary key auto increment with some prefix
MySQL can solve any selection based on its id in O(logn)
time using a simple BTREE
index. Primary keys
are keys that basically are a unique representation of each row (in this case, the id is the represenation of title). You would do a query like this:
SELECT id, title from table_1 WHERE id = '$id_to_select'
To parse the return result, you have an array of choices: mysqli_fetch_row
mysqli_fetch_array()
mysqli_fetch_assoc
I think the best one is mysqli_fetch_array
since you can specify how to fetch the returning row: MYSQLI_NUM
denotes the index, MYSQLI_ASSOC
denotes an associative return.
$row = mysqli_fetch_array($result, MYSQLI_ASSOC);
print_r($row);
//Array(
'id' => 1,
'title' => 'lorem ipsum'
)
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