How to use mySQL data in PHP for loop? - php

Question

I'm trying to get the last ID from mySQL script and then use it in PHP for loop to display each product that way so I don't need to type separately each one of them, maybe it's not the best solution, but this is prototyping. The problem is that nothing shows on the page when it's run, if there is a number instead of $last_id then it works
<?php
$serverName = "localhost";
$username = "root";
$password = "";
$connection = new mysqli($serverName, $username, $password);
if($connection -> connect_error)
{
die("Connection failed: " . $connection -> connect_error);
}
$last_id = "SELECT id FROM tab_mobiteli ORDER BY id DESC LIMIT 1";
for($i = 0; $i < $last_id; $i++) {
echo "<p>This is text</p>";
}
?>

Answer 1

How can you be sure that you'll have ID's in perfect order. There could be a number in there that does not exist, since you can later delete some rows in the database. Anyway I usualy use PDO instead of mysqli but here's the idea. Just read everything and then you can play with the output in foreach loop.
$stmt = $connection->query("SELECT * FROM tab_mobiteli");
foreach ($stmt as $row) {
// here you do what you want to do for each db entry
// for example "echo $row['id'];"
}

Answer 2

You aren't executing the query this is why it will display nothing.
Here is an example of a query to a mysql db using PDO, read more about here.
<?php
$dbh = new PDO('mysql:dbname=test;host=localhost','root','root');
$stmt = $dbh->prepare("SELECT id FROM tab_mobiteli ORDER BY id DESC LIMIT 1");
$stmt->execute();
$results = $stmt->fetchAll(PDO::FETCH_ASSOC);
if(count($results) > 0){
for($i = 0; $i < count($results); $i++) {
echo "<p>$results[$i]['id']</p>";
}
}
?>