How to show Images calling from Database with PHP only one time - php

Question

When I call images from the database random, it loads them x times, but I want to show them only once.
$random = array_rand(Database::query('SELECT * FROM ADVERTISEMENTS' ));
$adv_sql = "SELECT * FROM `ADVERTISEMENTS` WHERE `id` = $random ";
$advResult = Database::single($adv_sql, $random['id']);
$advExplode = explode('/', $advResult['upload']);
$advLocation = 'url/location' . end($advExplode);

Answer 1

I cannot understand your abstraction.
Your second query has condition id = $random, but you bind params in your single() method: $adv_sql, $random['id'].
We don't know your methods work, you should have shown us their implementation.
Anyway, isn't one query better for this?
SELECT * FROM `ADVERTISEMENTS` ORDER BY RAND() LIMIT 1
Or without LIMIT if you want to recieve all
If you don't want to show an already loaded image in the second request, you'd need to log which images where shown so far, into a database, cookies or sessions, depending on the needs.
Or, bind the shown images to an instance.
This is my test so far:
class Images {
private $_imagesShown = array("''");
private function getShownImages() {
return implode(',', $this->_imagesShown);
}
private function setShownImage($row) {
$this->_imagesShown[] = $row['id'];
}
public function getImages() {
$query = "SELECT id, image FROM images WHERE id NOT IN ({$this->getShownImages()})";
$result = mysqli_query($query);
$row = mysqli_fetch_assoc($result);
$this->setShownImage($row);
return $row;
}
}
$img = new Images();
var_dump($img->getImages());
var_dump($img->getImages());
var_dump($img->getImages());
var_dump($img->getImages());
var_dump($img->getImages());
var_dump($img->getImages());
var_dump($img->getImages());
var_dump($img->getImages());
Outputs:
array (size=2)
'id' => string '1' (length=1)
'img' => string '0.jpg' (length=1)
array (size=2)
'id' => string '2' (length=1)
'img' => string '1.jpg' (length=1)
array (size=2)
'id' => string '3' (length=1)
'img' => string '2.jpg' (length=1)
array (size=2)
'id' => string '4' (length=1)
'img' => string '3.jpg' (length=1)
array (size=2)
'id' => string '5' (length=1)
'img' => string '4.jpg' (length=1)
array (size=2)
'id' => string '6' (length=1)
'img' => string '12.jpg' (length=1)
array (size=2)
'id' => string '7' (length=1)
'img' => string '55.jpg' (length=1)
so each call of getImages() returns a non shown image